[] Shares BOOZ ALLEN HAMILTON HOLDING CORPORATION CLASS A COMMON STOCK, PAR VALUE $0.01 PER SHARE FORMOF UNDERWRITING AGREEMENT

Exhibit 1.1

[•] Shares

BOOZ ALLEN HAMILTON HOLDING CORPORATION

CLASS A COMMON STOCK, PAR VALUE $0.01 PER SHARE

FORM OF UNDERWRITING AGREEMENT

[•], 2010

[•], 2010

Morgan Stanley & Co. Incorporated
Barclays Capital Inc.

c/o		Morgan Stanley & Co. Incorporated
		1585 Broadway
		New York, New York 10036
c/o		Barclays Capital Inc.
		745 Seventh Avenue
		New York, New York 10019

Ladies and Gentlemen:

     Booz Allen Hamilton Holding Corporation, a Delaware corporation (the “Company”), proposes to issue and sell to the several Underwriters named in Schedule I hereto (the “Underwriters”), an aggregate of [•] shares of the Class A common stock, par value $0.01 per share, of the Company (the “Firm Shares”).

     The Company also agrees to issue and sell to the several Underwriters not more than an additional [•] shares of the Company’s Class A common stock, par value $0.01 per share (the “Additional Shares”) if and to the extent that you, as managers of the offering, shall have determined to exercise, on behalf of the Underwriters, the right to purchase such shares of Class A common stock granted to the Underwriters in Section 2 hereof. The Firm Shares and the Additional Shares are hereinafter collectively referred to as the “Shares.” The shares of Class A common stock, par value $0.01 per share, of the Company to be outstanding after giving effect to the sales contemplated hereby are hereinafter referred to as the “Common Stock.” The Company has filed with the Securities and Exchange Commission (the “Commission”) a registration statement on Form S-1 (File No. 333-167645), including a prospectus, relating to the Shares. The registration statement as amended at the time it becomes effective, including the information (if any) deemed to be part of the registration statement at the time of effectiveness pursuant to Rule 430A under the Securities Act of 1933, as amended (the “Securities Act”), is hereinafter referred to as the “Registration Statement”; the final prospectus in the form first filed with the Commission pursuant to Rule 424(b) under the Securities Act is hereinafter referred to as the “Prospectus.” If the Company has filed an abbreviated registration statement to register additional shares of Common Stock pursuant to Rule 462(b) under the Securities Act (the “Rule 462 Registration Statement”), then any reference herein to the term “Registration Statement” shall be deemed to include such Rule 462 Registration Statement.

     For purposes of this Agreement, “free writing prospectus” has the meaning set forth in Rule 405 under the Securities Act; “preliminary prospectus” means each preliminary prospectus included in the Registration Statement prior to the time it becomes effective or filed with the Commission pursuant to Rule 424(b) under the Securities Act; “broadly available road show” means a “bona fide electronic road show” as defined in Rule 433(h)(5) under the Securities Act that has been made available without restriction to any person; “Time of Sale Prospectus” means the preliminary prospectus included in the Registration Statement immediately prior to the Time of Sale (as defined below) together with the pricing information and free writing prospectuses, if any, in each case identified in Schedule II hereto; and “Time of Sale” means [•] [a.m.][p.m.] (New York time) on the date of this Agreement or, if the Time of Sale Prospectus is amended or supplemented by the Company subsequent to the Time of Sale and prior to the Closing Date (as defined in Section 4), such time and date the Underwriters first re-confirm the sale of the Shares.

     Morgan Stanley & Co. Incorporated (“Morgan Stanley”) has agreed to reserve 10% of the Firm Shares to be purchased by it under this Agreement for sale to the Company’s directors, officers, employees and business associates and other parties related to the Company (collectively, “Participants”), as set forth in the Prospectus under the heading “Underwriters” (the “Directed Share Program”). The Firm Shares to be sold by Morgan Stanley and its affiliates pursuant to the Directed Share Program are referred to hereinafter as the “Directed Shares”. Any Directed Shares not orally confirmed for purchase by any Participant by the end of the business day on which this Agreement is executed will be offered to the public by the Underwriters as set forth in the Prospectus.

     1. Representations and Warranties of the Company. The Company represents and warrants to and agrees with each of the Underwriters that:

     (a) The Registration Statement has been declared effective by the Commission; no stop order suspending the effectiveness of the Registration Statement is in effect, and no proceedings for such purpose are pending before, or to the Company’s knowledge, threatened by the Commission.

     (b) (i) The Registration Statement, when it became effective, did not contain and, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (ii) the Registration Statement complies and the Prospectus and the Registration Statement, as amended or supplemented, if applicable, will comply in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder, (iii) the Time of Sale Prospectus as of the Time of Sale

did not and, at the Closing Date (as defined in Section 4), the Time of Sale Prospectus, as then amended or supplemented by the Company, if applicable, will not, contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, (iv) each broadly available road show, if any, when considered together with the Time of Sale Prospectus, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading and (v) the Prospectus as of its date and as of the Closing Date, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, except that the representations and warranties set forth in this paragraph do not apply to statements in or omissions from the Registration Statement, the Time of Sale Prospectus or the Prospectus based upon and in conformity with written information furnished to the Company by any Underwriter through the Representatives specifically for use therein, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 9(b) hereof.

     (c) The Company is not an “ineligible issuer” as defined in Rule 405 under the Securities Act in connection with the offering of the Shares as contemplated by the Registration Statement pursuant to Rules 164 and 433 under the Securities Act. Any free writing prospectus that the Company is required to file pursuant to Rule 433(d) under the Securities Act has been, or will be, filed with the Commission in accordance with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Each free writing prospectus that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act or that was prepared by or on behalf of or used or referred to by the Company complies or will comply in all material respects with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Except for the free writing prospectuses, if any, identified in Schedule II hereto, and electronic road shows, if any, each furnished to you before first use, the Company has not prepared, used or referred to, and will not, without your prior consent, prepare, use or refer to, any free writing prospectus.

     (d) The Company has been duly incorporated, is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation, has the corporate power and authority to own its property and to conduct its business as described in the Time of Sale Prospectus and is duly qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good

standing would not, individually or in the aggregate, reasonably be expected to have a material adverse effect on the condition (financial or otherwise), business, properties or results of operations of the Company and its subsidiaries taken as a whole (a “Material Adverse Effect”) or a material adverse effect on the ability of the Company and its subsidiaries, taken as a whole, to perform its obligations under this Agreement or to consummate the transactions contemplated by the Time of Sale Prospectus.

     (e) Each subsidiary of the Company has been duly incorporated, is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation, has the corporate power and authority to own its property and to conduct its business as described in the Time of Sale Prospectus and is duly qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not have a Material Adverse Effect or a material adverse effect on the ability of the Company and its subsidiaries, taken as a whole, to perform its obligations under this Agreement or to consummate the transactions contemplated by the Time of Sale Prospectus; all of the issued shares of capital stock of each subsidiary of the Company have been duly and validly authorized and issued, are fully paid and non-assessable and are owned directly by the Company or a wholly owned subsidiary of the Company, free and clear of all liens, encumbrances, equities or claims.

     (f) This Agreement has been duly authorized, executed and delivered by the Company.

     (g) The authorized capital stock of the Company conforms as to legal matters to the description thereof contained in each of the Time of Sale Prospectus and the Prospectus.

     (h) The shares of Common Stock outstanding prior to the issuance of the Shares to be sold by the Company have been duly authorized and are validly issued, fully paid and non-assessable.

     (i) The Shares to be sold by the Company have been duly authorized and, when issued, paid for and delivered in accordance with the terms of this Agreement, will be validly issued, fully paid and non-assessable, and the issuance of such Shares will not be subject to any preemptive or similar rights.

     (j) The execution and delivery by the Company of, and the performance by the Company of its obligations under, this Agreement will not violate or breach: (i) any provision of applicable law; (ii) the certificate of incorporation or by-laws of the Company, as amended and restated as of the date hereof; (iii) any agreement or other instrument binding upon the Company or any

of its subsidiaries; or (iv) any applicable judgment, order or decree of any federal, state, local, international or foreign governmental authority, or any court, administrative or regulatory agency or commission or other governmental authority (each a “Governmental Entity”), having jurisdiction over the Company or any of its subsidiaries, except with respect to clauses (i), (iii) and (iv), for any such violation or breach which would not have a Material Adverse Effect. No consent, approval, authorization or order of, or qualification with, any such Governmental Entity is required for the performance by the Company of its obligations under this Agreement, except for (i) such consents, approvals, authorizations, registrations or qualifications as may be required under securities or Blue Sky laws of the various states or foreign countries or the rules and regulations of the Financial Industry Regulatory Authority (“FINRA”) in connection with the issue and sale of the Shares by the Company, (ii) such consents, approvals, authorizations, orders, registrations, qualifications, waivers, amendments or termination as will have been obtained or made as of the Time of Sale and (iii) where the failure to obtain or make any such consent, approval, authorization, order, registration or qualification would not have a Material Adverse Effect.

     (k) The execution and delivery by the Company of, and the performance by the Company of its obligations under, this Agreement will not require with respect to the Company or any subsidiary of the Company any license, consent, approval, action, order, authorization, or permit of, or registration, declaration or filing with, any Governmental Entity, including the (i) National Industrial Security Program Operating Manual notification requirements; (ii) notice requirements under International Traffic in Arms Regulations and other export control laws of the United States; and (iii) notification requirements in accordance with the Cost Accounting Standards (as defined in the Federal Acquisition Regulations, 48 CFR Chapter 99), except those that have been obtained or where the failure to obtain such license, consent, approval, action, order, authorization or permit of, or registration, declaration or filing would not have Material Adverse Effect.

     (l) There has not occurred any material adverse change, or any development involving a prospective material adverse change, in the condition, financial or otherwise, or in the earnings, business or operations of the Company and its subsidiaries, taken as a whole, from that set forth in the Time of Sale Prospectus.

     (m) There are no legal or governmental proceedings pending or, to the knowledge of the Company, threatened to which the Company or any of its subsidiaries is a party or to which any of the properties of the Company or any of its subsidiaries is subject, other than proceedings disclosed in the Time of Sale Prospectus or proceedings that would not have a Material Adverse Effect and would not have a material adverse effect on the power or ability of the Company

and its subsidiaries, taken as a whole, to perform its obligations under this Agreement or to consummate the transactions contemplated by the Time of Sale Prospectus.

     (n) Each preliminary prospectus filed as part of the registration statement as originally filed or as part of any amendment thereto, or filed pursuant to Rule 424 under the Securities Act, complied when so filed in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder.

     (o) The Company is not, and after giving effect to the offering and sale of the Shares and the application of the net proceeds thereof as described in the Prospectus will not be, required to register as an “investment company” as such term is defined in the Investment Company Act of 1940, as amended.

     (p) The Company and its subsidiaries (i) are in compliance with any and all applicable foreign, federal, state and local laws and regulations relating to the protection of human health and safety, the environment or hazardous or toxic substances or wastes, pollutants or contaminants (“Environmental Laws”), (ii) have received all permits, licenses or other approvals required of them under applicable Environmental Laws to conduct their respective businesses and (iii) are in compliance with all terms and conditions of any such permit, license or approval, except where such noncompliance with Environmental Laws, failure to receive required permits, licenses or other approvals or failure to comply with the terms and conditions of such permits, licenses or approvals would not have a Material Adverse Effect.

     (q) There are no contracts, agreements or understandings between the Company and any person granting such person the right to require the Company to file a registration statement under the Securities Act with respect to any securities of the Company, or to require the Company to include such securities with the Shares registered pursuant to the Registration Statement, in each case, other than as disclosed in the Time of Sale Prospectus.

     (r) Neither the Company, any of its subsidiaries nor any director or executive officer thereof, nor any affiliates of the Company or any of its subsidiaries, nor, to the Company’s knowledge, any employee, agent or representative of the Company or of any of its subsidiaries, has made any unlawful offer, payment, promise to pay, or authorization or approval of the payment or giving of money, property, gifts or anything else of value, directly or indirectly, to any “government official” (including any officer or employee of a government or government-owned or controlled entity or of a public international organization, or any person acting in an official capacity for or on behalf of any of the foregoing, or any political party or party official or candidate for political office) to influence official action or secure an improper advantage; and, to the

Company’s knowledge after due inquiry, the Company and its subsidiaries and affiliates have conducted their businesses in compliance with applicable anti-corruption laws and have instituted and maintain and will continue to maintain policies and procedures designed to promote and achieve compliance with such laws.

     (s) The operations of the Company and its subsidiaries are and have been conducted at all times in material compliance with all applicable financial recordkeeping and reporting requirements, including those of the Bank Secrecy Act, as amended by Title III of the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (USA PATRIOT Act), and, to the Company’s knowledge after due inquiry, the applicable anti-money laundering statutes of jurisdictions where the Company and its subsidiaries conduct business, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the “Anti-Money Laundering Laws”), and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Anti-Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

     (t) (i) The Company represents that neither the Company nor any of its subsidiaries, nor any director or executive officer thereof, nor, to the Company’s knowledge, any employee, any agent, affiliate or representative of the Company or any of its subsidiaries, is an individual or entity (“Person”) that is, or is owned or controlled by a Person that is (A) the subject of any sanctions administered or enforced by the U.S. Department of Treasury’s Office of Foreign Assets Control (“OFAC”) (collectively, “Sanctions”) or (B) located, organized or resident in a country or territory that is the subject of Sanctions (including, without limitation, Burma/Myanmar, Cuba, Iran, North Korea, Sudan and Syria) except to the extent permitted by OFAC. (ii) The Company represents and covenants that it will not, directly or indirectly, use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other Person: (A) to fund or facilitate any activities or business of or with any Person or in any country or territory that, at the time of such funding or facilitation, is the subject of Sanctions except to the extent permitted by OFAC; or (B) in any other manner that will result in a violation of Sanctions by any Person (including any Person participating in the offering, whether as underwriter, advisor, investor or otherwise) solely as a result of the Company making available such proceeds to such Person. (iii) The Company represents and covenants that for the past five years, it and its subsidiaries have not knowingly engaged in, are not now knowingly engaged in, and will not knowingly engage in, any dealings or transactions with any Person, or in any country or territory, that at the time of the dealing or transaction is or was the subject of Sanctions.

     (u) Subsequent to the respective dates as of which information is given in each of the Registration Statement, the Time of Sale Prospectus and the Prospectus, (i) the Company and its subsidiaries have not incurred any material liability or obligation, direct or contingent, nor entered into any material transaction; (ii) the Company has not purchased any of its outstanding capital stock, nor declared, paid or otherwise made any dividend or distribution of any kind on its capital stock other than ordinary and customary dividends; and (iii) there has not been any material change in the capital stock, short-term debt or long-term debt of the Company and its subsidiaries, except in each case as described in each of the Registration Statement, the Time of Sale Prospectus and the Prospectus, respectively.

     (v) The Company and its subsidiaries do not own any real property and the Company and its subsidiaries have good title to all personal property owned by them, in each case, that is material to the business of the Company and its subsidiaries taken as a whole, in each case free and clear of all liens, encumbrances and defects except such as are described in the Time of Sale Prospectus or such liens, encumbrances and defects that would not have a Material Adverse Effect; and, except as disclosed in the Time of Sale Prospectus, any real property and buildings held under lease by the Company and its subsidiaries are held by them under valid, subsisting and enforceable leases with such exceptions as would not have a Material Adverse Effect and subject to the effects of bankruptcy, insolvency, fraudulent conveyance, fraudulent transfer, reorganization and moratorium laws, and other similar laws relating to or affecting creditor’s rights and general equitable principles (whether considered in a proceeding in equity or at law).

     (w) The Company and its subsidiaries own or possess adequate rights to use all patents, patent rights, licenses, inventions, copyrights, know-how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures), trademarks, service marks and trade names currently employed by them in connection with the business now operated by them except where lack of ownership or possession of such rights would not have a Material Adverse Effect. Neither the Company nor any of its subsidiaries has received any notice of infringement of or conflict with asserted rights of others with respect to any of the foregoing, which, if the subject of an unfavorable decision, ruling or finding, would have a Material Adverse Effect.

     (x) No material labor dispute with the employees of the Company or any of its subsidiaries exists or, to the knowledge of the Company, is imminent except where such dispute would not have a Material Adverse Effect; and the Company is not aware of any existing, threatened or imminent labor disturbance by the employees of any of its contractors or subcontractors that would have a Material Adverse Effect.

     (y) The Company and each of its subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as the Company believes in good faith to be prudent and customary in the businesses in which they are engaged; neither the Company nor any of its subsidiaries has any reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business except where such failure to renew or obtain similar coverage would not have a Material Adverse Effect.

     (z) The Company and its subsidiaries possess all certificates, authorizations, permits and facility clearances and their personnel has security clearances issued by the appropriate federal, state or foreign regulatory authorities necessary to conduct their businesses except where failure to obtain such certificates, authorizations, permits and clearances would not reasonable be expected to have a Material Adverse Effect; and neither the Company nor any of its subsidiaries has received any notice of proceedings relating to the revocation or modification of any such certificate, authorization, permit or clearance which, if the subject of an unfavorable decision, ruling or finding, would have a Material Adverse Effect.

     (aa) The Company and each of its subsidiaries maintain a system of internal accounting controls sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s general or specific authorizations; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) and to maintain asset accountability; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. Except as described in the Time of Sale Prospectus, since the end of the Company’s most recent audited fiscal year, there has been (i) no material weakness in the Company’s internal control over financial reporting (whether or not remediated) and (ii) no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting (including any corrective actions with regard to significant deficiencies and material weaknesses).

     (bb) (i) The Company and its consolidated subsidiaries have established and maintain “disclosure controls and procedures” (as such term is defined in Rule 13a-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), (ii) such disclosure controls and procedures are designed to ensure that the information required to be disclosed about the Company and it subsidiaries in the reports the Company will file or submit under the Exchange

Act is accumulated and communicated to management of the Company, including its principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure to be made and (iii) such disclosure controls and procedures are effective to a reasonable level of assurance to perform the functions for which they were established.

     (cc) Except as described in the Registration Statement, the Company has not sold, issued or distributed any of its equity securities or any other securities convertible into or exercisable or exchangeable for its equity securities during the six-month period preceding the date hereof, including any sales pursuant to Rule 144A under, or Regulation D or S of, the Securities Act, other than shares issued pursuant to employee benefit plans, qualified stock option plans or other employee compensation plans or pursuant to outstanding options, rights or warrants.

     (dd) The Company and each of its subsidiaries have filed all federal, state, local and foreign tax returns required to be filed through the date of this Agreement or have requested extensions thereof (except where the failure to file would not have a Material Adverse Effect) and have paid all taxes required to be paid thereon (except for cases in which the failure to file or pay would not have a Material Adverse Effect, or, except as currently being contested in good faith and for which reserves required by U.S. GAAP have been created in the financial statements of the Company), and no tax deficiency has been determined adversely to the Company or any of its subsidiaries which has had, nor does the Company or any of its subsidiaries have any notice or knowledge of any tax deficiency which if determined adversely to the Company or its subsidiaries would have a Material Adverse Effect.

     (ee) The statistical and market-related data included under the captions “Prospectus Summary,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and “Business” in the most recent preliminary prospectus included in the Time of Sale Prospectus are based on or derived from sources that the Company believes to be reliable and accurate in all material respects or represent the Company’s good faith estimates that are made on the basis of data derived from such sources.

     (ff) The statements made in the Time of Sale Prospectus under the captions “Risk Factors,” “Business,” “Description of Capital Stock” and “Shares of Common Stock Eligible for Future Resale” insofar as they purport to constitute summaries of the terms of statutes, rules or regulations, legal or governmental proceedings or contracts and other documents, constitute accurate summaries of the terms of such statutes, rules and regulations, legal and governmental proceedings and contracts and other documents in all material respects.

     (gg) Each pension, profit sharing, welfare plan and other plan which is subject to the Employee Retirement Income Security Act of 1974, as amended (“ERISA”) for which the Company or any member of its “Controlled Group” (defined as any organization which is a member of a controlled group of corporations within the meaning of Section 414 of the Internal Revenue Code of 1986, as amended (the “Code”)) would have any liability (each a “Plan”) has been maintained in compliance with its terms and with the requirements of all applicable statutes, rules and regulations including ERISA and the Code; and none of the Company or any subsidiary has incurred any liability for any prohibited transaction or accumulated funding deficiency or any complete or partial withdrawal liability with respect to any Plan; except in each case, as would not have a Material Adverse Effect.

     (hh) Except as disclosed under the heading “Experts” in the most recent preliminary prospectus included in the Time of Sale Prospectus, Ernst & Young LLP, who have certified certain financial statements of the Company and its consolidated subsidiaries included in the Time of Sale Prospectus, whose report appears in the Time of Sale Prospectus and who have delivered the initial letter referred to in Section 5(e) hereof, are independent public accountants as required by the Securities Act and the rules and regulations thereof. The Company’s Audit Committee has concluded, after due inquiry with Ernst & Young LLP and upon consultation with legal counsel, that Ernst & Young LLP’s objectivity and impartiality of judgment has not been impaired with respect to Ernst & Young LLP’s audit engagement as the Company’s independent public accountants as required by the Securities Act and the rules and regulations thereof. These circumstances and conclusions were reviewed with the Staff of the Office of the Chief Accountant of the Commission, which did not disagree with such conclusion.

     (ii) Except as identified in the Time of Sale Prospectus, since the date of the most recent balance sheet of the Company and its consolidated subsidiaries reviewed or audited by Ernst & Young LLP and the audit committee of the board of directors of the Company, the Company has not been advised of (i) any significant deficiencies in the design or operation of internal controls that could reasonably be expected to materially adversely affect the ability of the Company and each of its subsidiaries to record, process, summarize and report financial data, or any material weaknesses in internal controls or (ii) any fraud, whether or not material, that involves management or other employees who have a significant role in the internal controls of the Company and each of its subsidiaries.

     (jj) The Company has not taken and will not take, directly or indirectly, any action designed to or that has constituted or that could reasonably be expected to cause or result in the stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Shares.

     (kk) The Shares have been approved for listing, subject to official notice of issuance and evidence of satisfactory distribution, on The New York Stock Exchange.

     (ll) The historical financial statements (including the related notes and supporting schedules) included in the Time of Sale Prospectus comply as to form in all material respects with the requirements of Regulation S-X under the Securities Act and present fairly in all material respects the financial condition, results of operations and cash flows of the Company and its subsidiaries on a consolidated basis at the dates and for the periods indicated and have been prepared in conformity with U.S. GAAP applied on a consistent basis throughout the periods involved.

     (mm) As of •, 2010 the Company’s total backlog was $[•], consisting of funded backlog, unfunded backlog and priced options of approximately $[•], approximately $[•] and approximately $[•], respectively, in each case, relating to the Company’s United States Government contracting business and calculated in a manner consistent with past practice and the Company’s policies and procedures (except with respect to the Company’s separately tracking information related to priced options beginning on April 1, 2008 as disclosed in the Time of Sale Prospectus). All contracts, task orders and options reflected in such total backlog amount were entered into in the ordinary course of business, consistent with past practice.

     (nn) Other than in connection with this Agreement and the Company's engagement letter with Solebury Capital LLC, dated as of [•], 2010, there is no investment banker, financial advisor, broker, finder or other intermediary which has been retained by, or is authorized to act on behalf of, the Company or any its subsidiaries which might be entitled to any fee or commission from the transactions contemplated hereby.

     (oo) Except as disclosed in the Time of Sale Prospectus, as of the date of this Agreement, neither the Company nor any of its subsidiaries is party to any contract containing covenants that would limit in any material respect the ability of the Company or any of its subsidiaries to (i) engage in any line of business or (ii) compete with any person in any market or line of business.

     (pp) Except as disclosed in the Time of Sale Prospectus, to the knowledge of the Company, there is no outstanding allegation of improper or illegal activities arising from any government audit or non-audit review, including without limitation, by the Defense Contract Audit Agency, of the Company or any of its subsidiaries or work performed by the Company or any of its subsidiaries that would have a Material Adverse Effect. Except as disclosed in the Time of Sale Prospectus, to the knowledge of the Company, there are no pending civil or criminal penalties or administrative sanctions arising from a government audit or non-audit review of the Company or any of its subsidiaries or work performed by

the Company or any of its subsidiaries, including, but not limited to, termination of contracts, forfeiture of profits, suspension of payments, fines, or suspension or debarment from doing business with any the United States Government or any agency thereof that would have a Material Adverse Effect.

     (qq) The Company’s cost accounting system complies with the Cost Accounting Standards (as defined in the Federal Acquisition Regulations, 48 C.F.R. Chapter 99) and, during the past three years, its bids and proposals for government contracts have complied with the Truth in Negotiations Act (as codified at 10 U.S.C. § 2306a and 41 U.S.C. 254b), in each case, except as would not have a Material Adverse Effect.

     (rr) The Registration Statement, the Prospectus, the Time of Sale Prospectus and any preliminary prospectus comply, and any amendments or supplements thereto will comply, with any applicable laws or regulations of foreign jurisdictions in which the Prospectus, the Time of Sale Prospectus or any preliminary prospectus, as amended or supplemented, if applicable, are distributed in connection with the Directed Share Program.

     (ss) No consent, approval, authorization or order of, or qualification with, any governmental body or agency, other than those obtained, is required in connection with the offering of the Directed Shares in any jurisdiction where the Directed Shares are being offered.

     (tt) The Company has not offered, or caused Morgan Stanley or any Morgan Stanley Entity as defined in Section 10 to offer, Shares to any person pursuant to the Directed Share Program with the specific intent to unlawfully influence (i) a customer or supplier of the Company to alter the customer’s or supplier’s level or type of business with the Company, or (ii) a trade journalist or publication to write or publish favorable information about the Company or its products.

     2. Agreements to Sell and Purchase. Upon the basis of the representations and warranties herein contained, but subject to the conditions hereinafter stated, the Company hereby agrees to sell to the several Underwriters, and each Underwriter agrees, severally and not jointly, to purchase from the Company at $[•] a share (the “Purchase Price”) the number of Firm Shares (subject to such adjustments to eliminate fractional shares as you may determine) set forth in Schedule I hereto opposite the name of such Underwriter.

     On the basis of the representations and warranties contained in this Agreement, and subject to its terms and conditions, the Company agrees to sell to the Underwriters the Additional Shares, and the Underwriters shall have the right to purchase, severally and not jointly, the Additional Shares from the Company at the Purchase Price. You may exercise this right on behalf of the Underwriters in

whole or from time to time in part by giving written notice to the Company (with a courtesy copy of such notice delivered to Debevoise & Plimpton LLP) not later than 30 days after the date of this Agreement. Any exercise notice shall specify the number of Additional Shares to be purchased by the Underwriters and the date on which such shares are to be purchased. Each purchase date must be at least two business days after the written notice is given and may not be earlier than the closing date for the Firm Shares nor later than ten business days after the date of such notice. Additional Shares may be purchased as provided in Section 4 hereof solely for the purpose of covering over-allotments made in connection with the offering of the Firm Shares. On each day, if any, that Additional Shares are to be purchased (an “Option Closing Date”), each Underwriter agrees, severally and not jointly, to purchase the number of Additional Shares (subject to such adjustments to eliminate fractional shares as you may determine) that bears the same proportion to the total number of Additional Shares to be purchased on such Option Closing Date as the number of Firm Shares set forth in Schedule I hereto opposite the name of such Underwriter bears to the total number of Firm Shares.

     The Company hereby agrees that, without the prior written consent of Morgan Stanley and Barclays Capital Inc. on behalf of the Underwriters which consent shall not be unreasonably withheld, it will not, during the period ending 180 days after the date of the Prospectus (the “180-day restricted period”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock beneficially owned (as such term is used in Rule 13d-3 of the Exchange Act) or any other securities so owned convertible into or exercisable or exchangeable for Common Stock or (2) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise or (3) file any registration statement with the Commission relating to the offering of any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock.

     The restrictions contained in the preceding paragraph shall not apply to (a) the Shares to be sold hereunder, (b) the issuance by the Company of shares of Common Stock upon the conversion or exchange of convertible or exchangeable securities or exercise of options or warrants outstanding as of the date of this Agreement or (c) issuances pursuant to the Company’s and its subsidiaries’ employee stock incentive or other benefit plans existing on the date of this Agreement, in each of case (b) and (c), as disclosed in the Registration Statement. Notwithstanding the foregoing, if (1) during the last 17 days of the 180-day restricted period the Company issues an earnings release or material news or a

material event relating to the Company occurs; or (2) prior to the expiration of the 180-day restricted period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the 180-day restricted period, the restrictions imposed by this agreement shall continue to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the occurrence of the material news or material event unless such extension is waived in writing by Morgan Stanley and Barclays Capital Inc. on behalf of the Underwriters. The Company shall promptly notify Morgan Stanley and Barclays Capital Inc. of any earnings release, material news or material event that may give rise to an extension of the 180-day restricted period.

     The Company further hereby agrees that, without the prior written consent of Morgan Stanley and Barclays Capital Inc. on behalf of the Underwriters (which consent shall not be unreasonably withheld), it will not, during the 180-day restricted period, waive, with respect to any individual or entity party thereto, the restrictions under Section 2 of the Amended and Restated Stockholders Agreement (the “Stockholders Agreement”), in the form of exhibit 4.3 to the Registration Statement to be entered into on the Closing Date by and among the Company (formerly known as Explorer Holding Corporation), a Delaware corporation, Explorer Coinvest LLC, a Delaware limited liability company, the Management Stockholders (as defined therein), the Other Stockholders (as defined therein). The Company further hereby agrees that, in the event the 180-day restricted period is extended pursuant to the immediately preceding paragraph, it will extend the restrictions under Section 2 of the Stockholders Agreement to the same extent that the 180-day restricted period is extended pursuant to the immediately preceding paragraph.

     3. Terms of Public Offering. The Company is advised by you that the Underwriters propose to make a public offering of their respective portions of the Shares as soon after the Registration Statement and this Agreement have become effective as in your judgment is advisable. The Company is further advised by you that the Shares are to be offered to the public initially at $[•] a share (the “Public Offering Price”) and to certain dealers selected by you at a price that represents a concession not in excess of $[•] a share under the Public Offering Price, and that any Underwriter may allow, and such dealers may reallow, a concession, not in excess of $[•] a share, to any Underwriter or to certain other dealers.

     4. Payment and Delivery. Payment for the Firm Shares to be sold by the Company shall be made to the Company in Federal funds immediately available in New York City against delivery of such Firm Shares for the respective accounts of the several Underwriters through the facilities of the Depositary Trust Company (“DTC”) at 10:00 a.m., New York City time, on [•], 2010, or at such other time on the same or such other date, not later than [•],

2010, as shall be designated by you in writing. The time and date of such payment are hereinafter referred to as the “Closing Date.”

     Payment for any Additional Shares shall be made to the Company in Federal funds immediately available in New York City against delivery of such Additional Shares for the respective accounts of the several Underwriters through the facilities of DTC at 10:00 a.m., New York City time, on the date specified in the corresponding notice described in Section 2 or at such other time on the same or on such other date, in any event not later than [•], 2010, as shall be designated by you in writing.

     The Firm Shares and Additional Shares shall be registered in such names and in such denominations as you shall request in writing not later than two full business days prior to the Closing Date or the applicable Option Closing Date, as the case may be. The Firm Shares and Additional Shares shall be delivered to you on the Closing Date or an Option Closing Date, as the case may be, for the respective accounts of the several Underwriters.

     5. Conditions to the Underwriters’ Obligations. The obligations of the Company to sell the Shares to the Underwriters and the several obligations of the Underwriters to purchase and pay for the Shares on the Closing Date are subject to the condition that the Registration Statement shall have become effective not later than [•] [a.]/[p.][m.] (New York City time) on the date hereof.

     The several obligations of the Underwriters are subject to the following further conditions:

     (a) Subsequent to the execution and delivery of this Agreement and prior to the Closing Date,

     (i) there shall not have occurred any downgrading, nor shall any public notice have been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded any of the indebtedness of the Company or any of its subsidiaries by any “nationally recognized statistical rating organization,” as such term is defined for purposes of Rule 436(g)(2) under the Securities Act; and

     (ii) there shall not have occurred any change, or any development involving a prospective change, in the condition, financial or otherwise, or in the earnings, business or operations of the Company and its subsidiaries, taken as a whole, from that set forth in the Time of Sale Prospectus as of the date of this Agreement that, in your judgment, is material and adverse and

makes it, in your judgment, impracticable to market the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus.

     (b) The Underwriters shall have received on the Closing Date a certificate, dated the Closing Date and signed by an executive officer of the Company, to the effect set forth in Section 5(a)(i) above and to the effect that the representations and warranties of the Company contained in this Agreement are true and correct as of the Closing Date and that the Company has complied with all of the agreements and satisfied all of the conditions on its part to be performed or satisfied hereunder on or before the Closing Date.

     The officer signing and delivering such certificate may rely upon the best of his or her knowledge as to proceedings threatened.

     (c) The Underwriters shall have received on the Closing Date and each applicable Option Closing Date an opinion and negative assurance letter of Debevoise & Plimpton LLP, outside counsel for the Company, dated the Closing Date and each applicable Option Closing Date, in the form and substance satisfactory to the Underwriters.

     (d) The Underwriters shall have received on the Closing Date and each applicable Option Closing Date an opinion of CG Appleby, General Counsel of the Company, dated the Closing Date and each applicable Option Closing Date, in the form and substance satisfactory to the Underwriters.

     (e) The Underwriters shall have received on the Closing Date and each applicable Option Closing Date an opinion of Latham & Watkins LLP, counsel for the Underwriters, dated the Closing Date, with respect to such matters as the Underwriters may reasonably request.

     (f) The Underwriters shall have received, on each of the date hereof and the Closing Date and on each Option Closing Date, a letter dated the date hereof or the Closing Date or the applicable Option Closing Date, as the case may be, in form and substance satisfactory to the Underwriters, from Ernst & Young LLP, independent public accountants, containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement, the Time of Sale Prospectus and the Prospectus; provided that the letter delivered on the Closing Date shall use a “cut-off date” not earlier than the date hereof.

     (g) The “lock-up” agreements, each substantially in the form of Exhibit A hereto, between you and certain shareholders, officers and directors of the Company listed on Schedule III hereto relating to sales and certain other

dispositions of shares of Common Stock or certain other securities, delivered to you on or before the date hereof, shall be in full force and effect on the Closing Date; and the restrictions of Section 2 of the Stockholders Agreement shall be in full force and effect with respect to all parties thereto on the Closing Date.

     (h) The Underwriters shall have received a certificate addressed to the Underwriters and dated as of the date hereof, of Samuel R. Strickland, Executive Vice President, Chief Financial Officer and Chief Administrative Officer of the Company, covering certain financial and accounting information in the Time of Sale Prospectus, substantially in the form attached hereto as Exhibit B.

     (i) The Shares to be delivered on the Closing Date or the applicable Option Closing Date shall have been approved for listing on the New York Stock Exchange, subject to official notice of issuance.

     (j) No order suspending the effectiveness of the Registration Statement shall be in effect, and no proceeding for such purpose pursuant to Section 8A under the Securities Act shall be pending before or, to the Company’s knowledge after due inquiry, threatened by the Commission; the Prospectus and each free writing prospectus required to be filed by the Company by Rule 433 under the Securities Act shall have been timely filed with the Commission under the Securities Act (in the case of a free writing prospectus to the extent required by Rule 433 under the Securities Act) and in accordance with Section 6(c) hereof; and all requests by the Commission for additional information shall have been complied with to the reasonable satisfaction of Morgan Stanley and Barclays Capital Inc.

     (k) The representations and warranties of the Company contained in this Agreement are true and correct as of the Closing Date and that the Company has complied with all of the agreements and satisfied all of the conditions on its part to be performed or satisfied hereunder on or before the Closing Date.

     The several obligations of the Underwriters to purchase Additional Shares hereunder are subject to the delivery to you on the applicable Option Closing Date of such documents as you may reasonably request with respect to the good standing of the Company, the due authorization and issuance of the Additional Shares to be sold on such Option Closing Date and other matters related to the issuance of such Additional Shares.

     6. Covenants of the Company. The Company covenants with each Underwriter as follows:

     (a) To furnish to you, without charge, six copies of the Registration Statement (including exhibits thereto) and for delivery to each other Underwriter a conformed copy of the Registration Statement (without exhibits thereto) and to

furnish to you in New York City, without charge, prior to 10:00 a.m. New York City time on the business day next succeeding the date of this Agreement and during the period mentioned in Section 6(e) or 6(f) below, as many copies of the Time of Sale Prospectus, the Prospectus and any supplements and amendments thereto or to the Registration Statement as you may reasonably request.

     (b) Before amending or supplementing the Registration Statement, the Time of Sale Prospectus or the Prospectus, to furnish to you a copy of each such proposed amendment or supplement and not to file any such proposed amendment or supplement to which you reasonably object, and to file with the Commission within the applicable period specified in Rule 424(b) under the Securities Act any prospectus required to be filed pursuant to such Rule.

     (c) To furnish to you a copy of each proposed free writing prospectus to be prepared by or on behalf of, used by, or referred to by the Company and not to use or refer to any proposed free writing prospectus to which you reasonably object.

     (d) Not to take any action that would result in an Underwriter or the Company being required to file with the Commission pursuant to Rule 433(d) under the Securities Act a free writing prospectus prepared by or on behalf of the Underwriter that the Underwriter otherwise would not have been required to file thereunder.

     (e) If the Time of Sale Prospectus is being used to solicit offers to buy the Shares at a time when the Prospectus is not yet available to prospective purchasers and any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Time of Sale Prospectus in order to make the statements therein, in the light of the circumstances, not misleading, or if any event shall occur or condition exist as a result of which the Time of Sale Prospectus conflicts with the information contained in the Registration Statement then on file, or if, in the opinion of counsel for the Underwriters, it is necessary to amend or supplement the Time of Sale Prospectus to comply with the Securities Act or the Exchange Act (as applicable) and, in each case, the rules and regulations promulgated thereunder, forthwith to prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to any dealer upon request, either amendments or supplements to the Time of Sale Prospectus so that the statements in the Time of Sale Prospectus as so amended or supplemented will not, in the light of the circumstances when the Time of Sale Prospectus is delivered to a prospective purchaser, be misleading or so that the Time of Sale Prospectus, as amended or supplemented, will no longer conflict with the Registration Statement, or so that the Time of Sale Prospectus, as amended or supplemented, will comply with the Securities Act or the Exchange

Act (as applicable) and, in each case, the rules and regulations promulgated thereunder.

     (f) If, during such period after the first date of the public offering of the Shares as in the opinion of counsel for the Underwriters the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is required by law to be delivered in connection with sales by an Underwriter or dealer, any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Prospectus in order to make the statements therein, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, not misleading, or if, in the opinion of counsel for the Underwriters, it is necessary to amend or supplement the Prospectus to comply with the Securities Act or the Exchange Act (as applicable) and, in each case, the rules and regulations promulgated thereunder, forthwith to prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to the dealers (whose names and addresses you will furnish to the Company) to which Shares may have been sold by you on behalf of the Underwriters and to any other dealers upon request, either amendments or supplements to the Prospectus so that the statements in the Prospectus as so amended or supplemented will not, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, be misleading or so that the Prospectus, as amended or supplemented, will comply with the Securities Act or the Exchange Act (as applicable) and, in each case, the rules and regulations promulgated thereunder.

     (g) To endeavor to qualify the Shares for offer and sale under the securities or Blue Sky laws of such jurisdictions as you shall reasonably request.

     (h) To make generally available to the Company’s security holders and to you as soon as practicable an earning statement (which need not be audited) covering a period of at least twelve months beginning with the first fiscal quarter of the Company occurring after the date of this Agreement which shall satisfy the provisions of Section 11(a) of the Securities Act and the rules and regulations of the Commission thereunder.

     (i) To comply with all applicable securities and other laws, rules and regulations in each jurisdiction in which the Directed Shares are offered in connection with the Directed Share Program.

     7. Expenses. Whether or not the transactions contemplated in this Agreement are consummated or this Agreement is terminated, the Company agrees to pay or cause to be paid all expenses incident to the performance of its obligations under this Agreement, including: (i) the fees, disbursements and expenses of the Company’s counsel and the Company’s accountants in connection

with the registration and delivery of the Shares under the Securities Act and all other costs of, and the Company’s fees or expenses in connection with, the preparation and filing of the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, any free writing prospectus prepared by or on behalf of or, used by, the Company and amendments and supplements to any of the foregoing, including all printing costs associated therewith, and the mailing and delivering of copies thereof to the Underwriters and dealers, in the quantities hereinabove specified, (ii) all costs and expenses related to the transfer and delivery of the Shares to the Underwriters, including any transfer or other taxes payable thereon, (iii) the cost of printing or producing any Blue Sky or Legal Investment memorandum in connection with the offer and sale of the Shares under state securities laws and all expenses in connection with the qualification of the Shares for offer and sale under state securities laws as provided in Section 6(g) hereof, including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky or Legal Investment memorandum not to exceed $25,000, (iv) all filing fees and the reasonable fees and disbursements of counsel to the Underwriters incurred in connection with the review and qualification of the offering of the Shares by FINRA, (v) all fees and expenses in connection with the preparation and filing of the registration statement on Form 8-A relating to the Common Stock and all costs and expenses incident to listing the Shares on the New York Stock Exchange and other applicable national securities exchanges and foreign stock exchanges, (vi) the cost of printing certificates representing the Shares, (vii) the costs and charges of any transfer agent, registrar or depositary, (viii) the costs and expenses of the Company relating to investor presentations on any “road show” undertaken in connection with the marketing of the offering of the Shares, including, without limitation, expenses associated with the preparation or dissemination of any electronic road show, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations with the prior approval of the Company, travel and lodging expenses of the representatives and officers of the Company (other than Representatives of the Underwriters) and any such consultants, and half the cost of any aircraft chartered in connection with the road show by the Company or by the Underwriters with the prior written approval of the Company, with the other half of such cost to be paid by the Underwriters, (ix) the document production charges and expenses associated with printing this Agreement and (x) all fees and disbursements of counsel incurred by the Underwriters in connection with the Directed Share Program and stamp duties, similar taxes or duties or other taxes, if any, incurred by the Underwriters in connection with the Directed Share Program and (xi) all other costs and expenses incident to the performance of the obligations of the Company hereunder for which provision is not otherwise made in this Section. It is understood, however, that except as provided in this Section, Section 9 entitled “Indemnity and Contribution,” Section 10 entitled “Directed Share

Program Indemnification” and the last paragraph of Section 11 below, the Underwriters will pay all of their costs and expenses, including fees and disbursements of their counsel, stock transfer taxes payable on resale of any of the Shares by them and any advertising expenses connected with any offers they may make.

     8. Covenants of the Underwriters. Each Underwriter severally covenants with the Company not to take any action that would result in the Company being required to file with the Commission under Rule 433(d) a free writing prospectus prepared by or on behalf of or used or referred to by such Underwriter that otherwise would not be required to be filed by the Company thereunder, but for the action of the Underwriter.

     9. Indemnity and Contribution. (a) The Company agrees to indemnify and hold harmless each Underwriter, each person, if any, who controls any Underwriter within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act, and each affiliate of any Underwriter within the meaning of Rule 405 under the Securities Act from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) caused by (i) any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or any amendment thereof, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act (taken together with the Time of Sale Prospectus), any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act (taken together with the Time of Sale Prospectus), or the Prospectus or any amendment or supplement thereto, (ii) with respect to the Registration Statement or any amendment or supplement thereto, the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading or (iii) with respect to any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus as defined in Rule 433(h) (taken together with the Time of Sale Prospectus), any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act (take together with the Time of Sale Prospectus), the Prospectus or any amendment or supplement thereto, the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein in the light of the circumstances under which they were made not misleading, in each case except insofar as such losses, claims, damages or liabilities are caused by any such untrue statement or omission or alleged untrue statement or omission based upon and in conformity with written information furnished to the Company by any Underwriter through the Representatives specifically for use therein, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 9(b) hereof

     (b) Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, the directors of the Company, the officers of the Company who sign the Registration Statement and each person, if any, who controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) caused by (i) any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or any amendment thereof, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act (taken together with the Time of Sale Prospectus), any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act (taken together with the Time of Sale Prospectus), or the Prospectus or any amended or thereto (ii) with respect to the Registration Statement or any amendment or supplement thereto, the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading or (iii) with respect to any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus as defined in Rule 433(h) (taken together with the Time of Sale Prospectus), any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act (take together with the Time of Sale Prospectus), the Prospectus or any amendment or supplement thereto, the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein in the light of the circumstances under which they were made not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in reliance upon and in conformity with written information furnished to the Company by such Underwriter through the Representatives specifically for use therein, it being understood and agreed that the only such information furnished by any Underwriter consists of the following information in the Prospectus furnished on behalf of any Underwriter: (i) the concession and reallowance figures appearing in the fifth sentence of the second paragraph under the caption “Underwriting,” (ii) the information in the sixth paragraph under the caption “Underwriting” relating to sales to discretionary accounts and (iii) the information contained in the twelfth paragraph under the caption “Underwriting” relating to stabilization transactions.

     (c) In case any proceeding (including any governmental investigation) shall be instituted involving any person in respect of which indemnity may be sought pursuant to Section 9(a) or 9(b), such person (the “indemnified party”) shall promptly notify the person against whom such indemnity may be sought (the “indemnifying party”) in writing and the indemnifying party, upon request of the indemnified party, shall retain counsel

reasonably satisfactory to the indemnified party to represent the indemnified party and any others the indemnifying party may designate in such proceeding and shall pay the fees and disbursements of such counsel related to such proceeding. In any such proceeding, any indemnified party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such indemnified party unless (i) the indemnifying party and the indemnified party shall have mutually agreed to the retention of such counsel or (ii) the named parties to any such proceeding (including any impleaded parties) include both the indemnifying party and the indemnified party and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that the indemnifying party shall not, in respect of the legal expenses of any indemnified party in connection with any proceeding or related proceedings in the same jurisdiction, be liable for (i) the fees and expenses of more than one separate firm (in addition to any local counsel) for all Underwriters and all persons, if any, who control any Underwriter within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act or who are affiliates of any Underwriter within the meaning of Rule 405 under the Securities Act and (ii) the fees and expenses of more than one separate firm (in addition to any local counsel) for the Company, its directors, its officers who sign the Registration Statement and each person, if any, who controls the Company within the meaning of either such Section. In the case of any such separate firm for the Underwriters and such control persons of any Underwriters, such firm shall be designated in writing by Morgan Stanley and Barclays Capital Inc. In the case of any such separate firm for the Company, and such directors, officers and control persons of the Company, such firm shall be designated in writing by the Company. The indemnifying party shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by the second and third sentences of this paragraph, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened proceeding in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party, unless such settlement (i) includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such proceeding and (ii)

does not include a statement as to or an admission of fault, culpability or a failure to act, by or on behalf of any indemnified party.

     (d) To the extent the indemnification provided for in Section 9(a) or 9(b) is unavailable to an indemnified party or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then each indemnifying party under such paragraph, in lieu of indemnifying such indemnified party thereunder, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the indemnifying party or parties on the one hand and the indemnified party or parties on the other hand from the offering of the Shares or (ii) if the allocation provided by clause 9(d)(i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause 9(d)(i) above but also the relative fault of the indemnifying party or parties on the one hand and of the indemnified party or parties on the other hand in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Underwriters on the other hand in connection with the offering of the Shares shall be deemed to be in the same respective proportions as the net proceeds from the offering of the Shares (before deducting expenses) received by the Company and the total underwriting discounts and commissions received by the Underwriters, in each case as set forth in the table on the cover of the Prospectus, bear to the aggregate Public Offering Price of the Shares. The relative fault of the Company on the one hand and the Underwriters on the other hand shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Underwriters’ respective obligations to contribute pursuant to this Section 9 are several in proportion to the respective number of Shares they have purchased hereunder, and not joint.

     (e) The Company and the Underwriters agree that it would not be just or equitable if contribution pursuant to Section 9 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in Section 9(d). The amount paid or payable by an indemnified party as a result of the losses, claims, damages and liabilities referred to in Section 9(d) shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by

such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 9, no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Shares underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages that such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The remedies provided for in this Section 9 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

     (f) The indemnity and contribution provisions contained in this Section 9 and the representations, warranties and other statements of the Company contained in this Agreement shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Underwriter, any person controlling any Underwriter or any affiliate of any Underwriter, or the Company, its officers or directors or any person controlling the Company and (iii) acceptance of and payment for any of the Shares.

     10. Directed Share Program Indemnification. (a) The Company agrees to indemnify and hold harmless Morgan Stanley, each person, if any, who controls Morgan Stanley within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act and each affiliate of Morgan Stanley within the meaning of Rule 405 of the Securities Act (“Morgan Stanley Entities”) from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) (i) caused by any untrue statement or alleged untrue statement of a material fact contained in any material prepared by or with the consent of the Company for distribution to Participants in connection with the Directed Share Program or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading; (ii) caused by the failure of any Participant to pay for and accept delivery of Directed Shares that the Participant agreed to purchase; or (iii) related to, arising out of, or in connection with the Directed Share Program, other than losses, claims, damages or liabilities (or expenses relating thereto) that are finally judicially determined to have resulted from the bad faith or gross negligence of Morgan Stanley Entities.

     (b) In case any proceeding (including any governmental investigation) shall be instituted involving any Morgan Stanley Entity in respect of which indemnity may be sought pursuant to Section 10(a), the Morgan Stanley Entity

seeing indemnity, shall promptly notify the Company in writing and the Company, upon request of the Morgan Stanley Entity, shall retain counsel reasonably satisfactory to the Morgan Stanley Entity to represent the Morgan Stanley Entity and any others the Company may designate in such proceeding and shall pay the fees and disbursements of such counsel related to such proceeding. In any such proceeding, any Morgan Stanley Entity shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such Morgan Stanley Entity unless (i) the Company shall have agreed to the retention of such counsel or (ii) the named parties to any such proceeding (including any impleaded parties) include both the Company and the Morgan Stanley Entity and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. The Company shall not, in respect of the legal expenses of the Morgan Stanley Entities in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in addition to any local counsel) for all Morgan Stanley Entities. Any such separate firm for the Morgan Stanley Entities shall be designated in writing by Morgan Stanley. The Company shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the Company agrees to indemnify the Morgan Stanley Entities from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time a Morgan Stanley Entity shall have requested the Company to reimburse it for fees and expenses of counsel as contemplated by the second and third sentences of this paragraph, the Company agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by the Company of the aforesaid request and (ii) the Company shall not have reimbursed the Morgan Stanley Entity in accordance with such request prior to the date of such settlement. The Company shall not, without the prior written consent of Morgan Stanley, effect any settlement of any pending or threatened proceeding in respect of which any Morgan Stanley Entity is or could have been a party and indemnity could have been sought hereunder by such Morgan Stanley Entity, unless such settlement includes an unconditional release of the Morgan Stanley Entities from all liability on claims that are the subject matter of such proceeding.

     (c) To the extent the indemnification provided for in Section 10(a) is unavailable to a Morgan Stanley Entity or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then the Company in lieu of indemnifying the Morgan Stanley Entity thereunder, shall contribute to the amount paid or payable by the Morgan Stanley Entity as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Morgan Stanley Entities on the other hand from the offering of the Directed Shares or (ii) if the allocation provided by clause 10(c)(i) above is not permitted by applicable

law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause 10(c)(i) above but also the relative fault of the Company on the one hand and of the Morgan Stanley Entities on the other hand in connection with any statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Morgan Stanley Entities on the other hand in connection with the offering of the Directed Shares shall be deemed to be in the same respective proportions as the net proceeds from the offering of the Directed Shares (before deducting expenses) and the total underwriting discounts and commissions received by the Morgan Stanley Entities for the Directed Shares bear to the aggregate Public Offering Price of the Directed Shares. If the loss, claim, damage or liability is caused by an untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact, the relative fault of the Company on the one hand and the Morgan Stanley Entities on the other hand shall be determined by reference to, among other things, whether the untrue or alleged untrue statement or the omission or alleged omission relates to information supplied by the Company or by the Morgan Stanley Entities and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

     (d) The Company and the Morgan Stanley Entities agree that it would not be just or equitable if contribution pursuant to this Section 10 were determined by pro rata allocation (even if the Morgan Stanley Entities were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in Section 10(c). The amount paid or payable by the Morgan Stanley Entities as a result of the losses, claims, damages and liabilities referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by the Morgan Stanley Entities in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 10, no Morgan Stanley Entity shall be required to contribute any amount in excess of the amount by which the total price at which the Directed Shares distributed to the Participants were offered to the Participants exceeds the amount of any damages that such Morgan Stanley Entity has otherwise been required to pay. The remedies provided for in this Section 10 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

     The indemnity and contribution provisions contained in this Section 10 shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Morgan Stanley Entity or the Company, its officers or directors or any person controlling the Company and (iii) acceptance of and payment for any of the Directed Shares.

     11. Termination. The Underwriters may terminate this Agreement by notice given by you to the Company, if after the execution and delivery of this Agreement and prior to the Closing Date (i) trading generally shall have been suspended or materially limited on, or by, as the case may be, any of the New York Stock Exchange, the American Stock Exchange, the NASDAQ Global Market, the Chicago Board of Options Exchange, the Chicago Mercantile Exchange or the Chicago Board of Trade or other relevant exchanges, (ii) trading of any securities of the Company shall have been suspended on any exchange or in any over-the-counter market, (iii) a material disruption in securities settlement, payment or clearance services in the United States or other relevant jurisdictions shall have occurred, (iv) any moratorium on commercial banking activities shall have been declared by Federal or New York State authorities or (v) there shall have occurred any outbreak or escalation of hostilities, or any change in financial markets, or any calamity or crisis that, in your judgment, is material and adverse and which, singly or together with any other event specified in this clause (v), makes it, in your judgment, impracticable or inadvisable to proceed with the offer, sale or delivery of the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus or the Prospectus.

     12. Effectiveness; Defaulting Underwriters. This Agreement shall become effective upon the execution and delivery hereof by the parties hereto.

     If, on the Closing Date or an Option Closing Date, as the case may be, any one or more of the Underwriters shall fail or refuse to purchase Shares that it has or they have agreed to purchase hereunder on such date, and the aggregate number of Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase is not more than one-tenth of the aggregate number of the Shares to be purchased on such date, the other Underwriters shall be obligated severally in the proportions that the number of Firm Shares set forth opposite their respective names in Schedule I hereto bears to the aggregate number of Firm Shares set forth opposite the names of all such non-defaulting Underwriters, or in such other proportions as you may specify, to purchase the Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase on such date; provided that in no event shall the number of Shares that any Underwriter has agreed to purchase pursuant to this Agreement be increased pursuant to this Section 12 by an amount in excess of one-ninth of such number of Shares without the written consent of such Underwriter. If, on the Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase Firm Shares and the aggregate number of Firm Shares with respect to which such default occurs is more than one-tenth of the aggregate number of Firm Shares to be purchased on such date, and arrangements satisfactory to you and the Company for the purchase of such Firm Shares are not made within 36 hours after such default, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter or the Company. In any such case either you or the Company shall have the right to

postpone the Closing Date, but in no event for longer than seven days, in order that the required changes, if any, in the Registration Statement, in the Time of Sale Prospectus, in the Prospectus or in any other documents or arrangements may be effected. If, on an Option Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase Additional Shares and the aggregate number of Additional Shares with respect to which such default occurs is more than one-tenth of the aggregate number of Additional Shares to be purchased on such Option Closing Date, the non-defaulting Underwriters shall have the option to (i) terminate their obligation hereunder to purchase the Additional Shares to be sold on such Option Closing Date or (ii) purchase not less than the number of Additional Shares that such non-defaulting Underwriters would have been obligated to purchase in the absence of such default. Any action taken under this paragraph shall not relieve any defaulting Underwriter from liability in respect of any default of such Underwriter under this Agreement.

     If this Agreement shall be terminated by the Underwriters, or any of them, because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason any the Company shall be unable to perform its obligations under this Agreement, the Company will reimburse the Underwriters or such Underwriters as have so terminated this Agreement with respect to themselves, severally, for all out-of-pocket expenses (including the fees and disbursements of their counsel) reasonably incurred by such Underwriters in connection with this Agreement or the offering contemplated hereunder.

     13. Entire Agreement. (a) This Agreement, together with any contemporaneous written agreements and any prior written agreements (to the extent not superseded by this Agreement) that relate to the offering of the Shares, represents the entire agreement between the Company, on the one hand, and the Underwriters, on the other, with respect to the preparation of any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, the conduct of the offering, and the purchase and sale of the Shares.

     (b) The Company acknowledges that in connection with the offering of the Shares: (i) the Underwriters have acted at arms length, are not agents of, and owe no fiduciary duties to, the Company or any other person, (ii) the Underwriters owe the Company only those duties and obligations set forth in this Agreement and prior written agreements (to the extent not superseded by this Agreement), if any, and (iii) the Underwriters may have interests that differ from those of the Company. The Company waives to the full extent permitted by applicable law any claims it may have against the Underwriters arising from an alleged breach of fiduciary duty in connection with the offering of the Shares.

     14. Counterparts. This Agreement may be signed in two or more counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

     15. Applicable Law. This Agreement shall be governed by and construed in accordance with the internal laws of the State of New York.

     16. Headings. The headings of the sections of this Agreement have been inserted for convenience of reference only and shall not be deemed a part of this Agreement.

     17. Notices. All communications hereunder shall be in writing and effective only upon receipt and if to the Underwriters shall be delivered, mailed or sent to you in care of Morgan Stanley & Co. Incorporated, 1585 Broadway, New York, New York 10036, Attention: Equity Syndicate Desk, with a copy to the Legal Department; and in the case of Barclays Capital Inc., 745 Seventh Avenue, New York, New York 10019, Attention: Equity Syndication Desk, with a copy to the Legal Department; and if to the Company shall be delivered, mailed or sent to 8283 Greensboro Drive, McLean, Virginia 22102, Attention: Chief Financial Officer and with copies to 8283 Greensboro Drive, McLean, Virginia 22102, Attention: Deputy General Counsel and Debevoise & Plimpton LLP, 919 Third Avenue, New York, New York 10022, Attention: Matthew Kaplan.

Accepted as of the date hereof

Morgan Stanley & Co. Incorporated
Barclays Capital Inc.

Acting severally on behalf of themselves and
     the several Underwriters named in
     Schedule I hereto

By:		Morgan Stanley & Co. Incorporated
By:
		Name:
		Title:
By:		Barclays Capital Inc.
By:
		Name:
		Title:

SCHEDULE I

		Number of Firm Shares
Underwriter		To Be Purchased
Morgan Stanley & Co. Incorporated
Barclays Capital Inc.
Merrill Lynch, Pierce, Fenner & Smith Incorporated
Credit Suisse Securities (USA) LLC
Stifel Nicolaus & Company, Incorporated
BB&T Capital Markets, a division of Scott & Stringfellow, LLC
Lazard Capital Markets LLC
Raymond James & Associates, Inc.
Total:

SCHEDULE II

1.		Preliminary Prospectus issued [date]
2.		[Any free writing prospectuses filed by the Company under Rule 433(d) of the Securities Act to be identified]
3.		[Any free writing prospectus containing a description of terms that does not reflect final terms, if the Time of Sale Prospectus does not include a pricing sheet, to be indentified]
4.		[Any orally communicated pricing information to be included on Schedule II if a pricing term sheet is not used]

SCHEDULE III

Explorer Coinvest LLC

Ralph W. Shrader

Samuel R. Strickland

CG Appleby

Horacio D. Rozanski

Joseph E. Garner

Francis J. Henry, Jr.

Lloyd Howell, Jr.

Joseph Logue

Joseph W. Mahaffee

John D. Mayer

John M. McConnell

Patrick F. Peck

Peter Clare

Ian Fujiyama

Allan M. Holt

Philip A. Odeen

Charles O. Rossotti

EXHIBIT A

[FORM OF LOCK-UP LETTER]

____________, 2010

Morgan Stanley & Co. Incorporated
Barclays Capital Inc.

c/o		Morgan Stanley & Co. Incorporated
		1585 Broadway
		New York, New York 10036
c/o		Barclays Capital Inc.
		745 Seventh Avenue
		New York, New York 10019

     The undersigned understands that Morgan Stanley & Co. Incorporated and Barclays Capital Inc., as representatives (the “Representatives”) of the several underwriters (together with the Representatives, the “Underwriters”), propose to enter into an Underwriting Agreement (the “Underwriting Agreement”) with Booz Allen Hamilton Holding Corporation, a Delaware corporation (the “Company”), providing for the public offering (the “Public Offering”) by the Underwriters, of shares (the “Shares”) of the Class A common stock, par value $0.01 per share, of the Company (the “Common Stock”).

     To induce the Underwriters that may participate in the Public Offering to continue their efforts in connection with the Public Offering, the undersigned hereby agrees that, without the prior written consent of the Representatives on behalf of the Underwriters, the undersigned will not, during the period commencing on the date hereof and ending 180 days (the “restricted period”) after the date of the final prospectus relating to the Public Offering (the “Prospectus”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock beneficially owned (as such term is used in Rule 13d-3 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), by the undersigned or any other securities so owned convertible into or exercisable or exchangeable for Common Stock or (2) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise. The

foregoing sentence shall not apply to (a) transactions relating to shares of Common Stock or other securities acquired in open market transactions after the completion of the Public Offering, provided that no filing under Section 16(a) of the Exchange Act shall be required or shall be voluntarily made during the restricted period in connection with subsequent sales of Common Stock or other securities acquired in such open market transactions, (b) transfers of shares of Common Stock or any security convertible into Common Stock by bona fide gift, will or intestacy, (c) distributions of shares of Common Stock or any security convertible into Common Stock to general or limited partners, members or stockholders of the undersigned and partnerships or limited liability companies for the benefit of the immediate family of the undersigned and the partners and members of which are only the undersigned and the immediate family of the undersigned, (d) distributions of shares of Common Stock or any security convertible into Common Stock to any trust for the direct or indirect benefit of the undersigned or the immediate family of the undersigned or (e) dispositions of shares of Common Stock to the Company (A) to satisfy tax withholding obligations in connection with the exercise of options to purchase Common Stock or (B) in connection with the rights of the Company to cause the undersigned to sell shares of Common Stock in effect on the date hereof; provided that in the case of any transfer or distribution pursuant to clause (b), (c) or (d), (i) each donee, distributee, trustee or transferee shall sign and deliver a lock-up letter substantially in the form of this letter and (ii) no filing under Section 16(a) of the Exchange Act, reporting a reduction in beneficial ownership of shares of Common Stock, shall be required or shall be voluntarily made during the restricted period (other than a Form 5 required to be filed within the 45 calendar days following March 31, 2011 and filed during such 45 calendar day period or thereafter). For the purposes of this agreement, “immediate family” shall include any spouse, or any lineal ancestor or descendent, niece, nephew, adopted child, or sibling of him or her or of such spouse, niece, nephew or adopted child. In addition, the undersigned agrees that, without the prior written consent of the Representatives on behalf of the Underwriters, it will not, during the period commencing on the date hereof and ending upon expiration of the restricted period (as the same may be extended as provided herein), make any demand for or exercise any right with respect to, the registration of any shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock. The undersigned also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of the undersigned’s shares of Common Stock except in compliance with the foregoing restrictions.

     If:

     (1) during the last 17 days of the restricted period the Company issues an earnings release or material news or a material event relating to the Company occurs; or

     (2) prior to the expiration of the restricted period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the restricted period;

the restrictions imposed by this agreement shall continue to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the occurrence of the material news or material event.

     The undersigned shall not engage in any transaction that may be restricted by this agreement during the 34-day period beginning on the last day of the initial restricted period unless the undersigned requests and receives prior written confirmation from the Company that the restrictions imposed by this agreement have expired.

     The undersigned understands that the Company and the Underwriters are relying upon this agreement in proceeding toward consummation of the Public Offering. The undersigned further understands that this agreement is irrevocable and shall be binding upon the undersigned’s heirs, legal representatives, successors and assigns.

     Whether or not the Public Offering actually occurs depends on a number of factors, including market conditions. Any Public Offering will only be made pursuant to an Underwriting Agreement, the terms of which are subject to negotiation between the Company and the Underwriters.

     Notwithstanding anything to the contrary, if the closing of the sale of the Shares to the Underwriters pursuant to the Underwriting Agreement has not occurred prior to December 31, 2010, this agreement shall terminate and have no further force or effect.

EXHIBIT B

Ladies and Gentlemen:

I, Samuel R. Strickland, Executive Vice President, Chief Financial Officer and Chief Administrative Officer, of Booz Allen Hamilton Holding Corporation (the “Company”), have responsibility for financial matters with respect to the Company.

In connection with the preliminary prospectus, dated October ___, 2010 (the “Preliminary Prospectus”), relating to the sale by the Company of [•] shares of the Company’s Class A common stock, par value $0.01 per share, and Schedule II to the Underwriting Agreement, dated of October ___, 2010 (together with the Preliminary Prospectus, the “Time of Sale Prospectus”), I hereby certify that the financial information included in the Time of Sale Prospectus and circled in Exhibit A attached hereto has been compared to or computed from, and found to be in agreement with: (i) the preliminary financial statements and accounting records, as applicable, of the Company for the period ended September 30, 2010 as updated to the date of the Time of Sale Prospectus; (ii) the Company’s general ledger or other accounting books and records for the periods indicated; and/or (iii) a schedule or report prepared by the Company from the Company’s accounting and/or operational records.

Very truly yours,