UBS LOAN FINANCE LLC 677 Washington Boulevard Stamford, Connecticut 06901 UBS SECURITIES LLC 299 Park Avenue New York, New York 10171

Exhibit 10.1

April 3, 2011

Ducommun Incorporated

23301 Wilmington Avenue

Carson, CA 90745-6209

Bank and Bridge Facilities Commitment Letter

Ladies and Gentlemen:

You have advised UBS Loan Finance LLC (“UBS”), UBS Securities LLC (“UBSS”), Credit Suisse AG (acting through such of its affiliates or branches as it deems appropriate, “CS”) and Credit Suisse Securities (USA) LLC (“CS Securities” and, together with CS and their respective affiliates, “Credit Suisse”, and Credit Suisse, together with UBS and UBSS, the “Commitment Parties”, “we” or “us”) that Ducommun Incorporated, a Delaware corporation (“you” or “Borrower”), proposes to acquire (the “Acquisition”) an entity identified to us and known to us as Intrepid (the “Acquired Business”). The Acquisition will be effected pursuant to an agreement and plan of merger (the “Acquisition Agreement”) among Borrower, a wholly owned subsidiary of Borrower (“Merger Sub”) and the Acquired Business. All references to “dollars” or “$” in this agreement and the annexes and any other attachments hereto (collectively, this “Commitment Letter”) are references to United States dollars. All references to “Borrower” or “Borrower and its subsidiaries” for any period from and after consummation of the Acquisition shall include the Acquired Business.

We understand that the sources of funds required to fund the Acquisition consideration, to repay all indebtedness of Borrower and the Acquired Business and their respective subsidiaries, to pay fees, commissions and expenses in connection with the Transactions (as defined below) and to provide ongoing working capital requirements of Borrower and its subsidiaries following the Transactions will include:

No other financing will be required for the uses described above. Immediately following the Transactions, neither Borrower nor any of its subsidiaries will have any indebtedness or preferred equity other than the Bank Facilities, the Notes or the Bridge Facility and certain limited indebtedness to be agreed. As used herein, (i) the term “Transactions” means the Acquisition, the Refinancing (as defined below), the entering into of this Commitment Letter, the entering into of the Bank Facilities and the initial borrowings thereunder, the issuance of the Notes or the borrowings under the Bridge Facility and the payments of fees, commissions and expenses in connection with each of the foregoing and (ii) the term “Refinancing” means the repayment of all existing funded indebtedness of Borrower and the Acquired Business and their respective subsidiaries (other than certain limited indebtedness to be agreed).

Commitments.

You have requested that UBS and CS commit to provide the Facilities and that UBSS and CS Securities agree to structure, arrange and syndicate the Facilities.

Each of UBS and CS (in such capacities, collectively, the “Initial Bank Lenders”) is pleased to advise you of its several, not joint, commitment to provide 50% of the entire amount of the Term Loan Facility and 50% of the entire amount of the Revolving Credit Facility to Borrower upon the terms and subject to the conditions set forth or referred to in this Commitment Letter. The commitments of the Initial Bank Lenders and each other Bank Lender (as defined below) hereunder are subject to the negotiation, execution and delivery of definitive documentation (the “Bank Documentation”) with respect to the Bank Facilities reasonably satisfactory to the Initial Bank Lenders and the other Bank Lenders reflecting, among other things, the terms and conditions set forth in the Bank Term Sheet, in Annex III hereto (the “Conditions Annex”) and in the letter of even date herewith addressed to you providing, among other things, for certain fees relating to the Facilities (the “Fee Letter”). In addition, each of CS and UBS (in such capacities, collectively, the “Initial Bridge Lenders”; UBS and CS in their capacities as the Initial Bank Lenders and/or the Initial Bridge Lenders, the “Initial Lenders”) are pleased to advise you of its several, not joint, commitment to provide 50% of the entire amount of the Bridge Facility to Borrower upon the terms and subject to the conditions set forth or referred to in this Commitment Letter. It is understood and agreed that (i) UBS and UBSS will have “lead left” placement on all marketing materials relating to the Bank Facilities and will perform the duties and exercise the authority customarily performed and exercised by them in such role, including acting as sole manager of the physical books and (ii) Credit Suisse will have “lead left” placement on all marketing materials relating to the Bridge Facilities and will perform the duties and exercise the authority customarily performed and exercised by them in such role, including acting as sole manager of the physical books. The commitments of the Initial Bridge Lenders and each other Bridge Lender (as defined below) hereunder are subject to the negotiation, execution and delivery of definitive documentation (the “Bridge Documentation” and, together with the Bank Documentation, the “Financing Documentation”) with respect to the Bridge Facility reasonably satisfactory to the Initial Bridge Lenders and the other Bridge Lenders reflecting, among other things, the terms and conditions set forth in the Bridge Term Sheet, the Conditions Annex and the Fee Letter. You

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agree that the closing date of the Transactions and the concurrent closing of the Facilities, and if applicable, the Notes Offering (the “Closing Date”) shall be a date mutually agreed upon between you and us, but in any event shall not occur until all of the terms and conditions in this Commitment Letter (including the conditions to initial funding) have been satisfied or waived in writing by the Lead Arrangers.

Without in any way limiting the provisions under “Clear Market” below or any of the conditions under this Commitment Letter, the several commitments of the Initial Bank Lenders in respect of the Term Loan Facility shall be reduced, on a dollar-for-dollar basis pro rata in accordance with their respective commitments, by the net cash proceeds of any offer and sale for cash by you or your subsidiaries of capital stock of Borrower or its subsidiaries or debt that is convertible into capital stock of Borrower or its subsidiaries after the date hereof and prior to the Closing Date pursuant to a registration statement declared effective by the Securities and Exchange Commission (other than a registration statement on Form S-8 or otherwise relating to equity securities issuable under any employee benefit plan of Borrower or its subsidiaries) or pursuant to an exemption from the registration requirements of the Securities Act of 1933, as amended (the “Securities Act”, and such offering of capital stock or debt convertible into capital stock, a “Qualified Equity Offering”).

Syndication.

It is agreed that UBSS and CS Securities will act as the exclusive joint advisors, arrangers and bookmanagers for the Facilities, and, in consultation with you, will exclusively manage the syndication of the Facilities, and will, in such capacities, exclusively perform the duties and exercise the authority customarily associated with such roles (in such capacities, the “Lead Arrangers”). It is further agreed that no additional advisors, agents, co-agents, arrangers or bookmanagers will be appointed and no Lender (as defined below) will receive compensation with respect to any of the Facilities outside the terms contained in this Commitment Letter and the Fee Letter in order to obtain its commitment to participate in such Facilities, in each case unless you and we so agree.

The Lead Arrangers reserve the right, prior to or after execution of the Bank Documentation, in consultation with you, to syndicate all or a portion of the Initial Bank Lenders’ commitments to one or more institutions that will become parties to the Bank Documentation (the Initial Bank Lenders and the institutions becoming parties to the Bank Documentation with respect to all or a portion of the Bank Facilities, the “Bank Lenders”). The Lead Arrangers reserve the right, prior to or after the execution of the Bridge Documentation, to syndicate all or a portion of the Initial Bridge Lenders’ commitments to one or more institutions that will become parties to the Bridge Documentation (the Initial Bridge Lenders and the institutions becoming parties to the Bridge Documentation, the “Bridge Lenders” and, together with the Bank Lenders, the “Lenders”). Each Initial Lender agrees not to syndicate any of the commitments with respect to the Facilities to those financial institutions and other entities that have been specified by you in a separate letter (which references this Commitment Letter) delivered to the Initial Lenders on or prior to the date of such Initial Lenders’ signing of this Commitment Letter (such financial institutions and other entities referred to as “Disqualified Parties”). Notwithstanding the Lead Arrangers’ right to syndicate the Facilities and receive commitments with respect thereto, the Initial Lenders will not be relieved of all or any portion of their commitments hereunder prior to the Closing Date and, unless you otherwise agree in writing, each Commitment Party shall retain exclusive control over all rights and obligations with respect to its commitments in respect of the Facilities, including all rights with respect to consents, modifications, supplements, waivers and amendments, until the Closing Date. Without limiting your obligations to assist with syndication efforts as set forth herein, the Initial Lenders agree that completion of such syndications is not a condition to their commitments hereunder.

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The Lead Arrangers will exclusively manage, in consultation with you, all aspects of the syndication of the Facilities, including selection of additional Lenders (that are not Disqualified Parties), determination of when the Lead Arrangers will approach potential additional Lenders, awarding of any naming rights and the final allocations of the commitments in respect of the Facilities among the additional Lenders. You agree to, and to use commercially reasonable efforts to cause the Acquired Business to (including with a covenant to such effect in the Acquisition Agreement), actively assist the Lead Arrangers in achieving a timely syndication of the Facilities that is reasonably satisfactory to the Lead Arrangers and the Lenders participating in such Facilities. To assist the Lead Arrangers in their syndication efforts, you agree that you will, and will use commercially reasonable efforts to cause your representatives and advisors that are not employees and the Acquired Business and its representatives and advisors to, until the earlier of (1) 90 days after the Closing Date and (2) a Successful Syndication (as defined in the Fee Letter), (a) promptly prepare and provide all financial and other information as we may reasonably request with respect to you, the Acquired Business, your and their respective subsidiaries and the Transactions, including but not limited to financial projections (the “Projections”) relating to the foregoing, (b) provide copies of any due diligence reports or memoranda prepared at your direction or at the direction of any of your affiliates by legal, accounting, tax or other advisors in connection with the Acquisition (subject to the delivery of customary non-disclosure agreements reasonably acceptable to the Lead Arrangers), (c) use commercially reasonable efforts to ensure that such syndication efforts benefit materially from your existing lending relationships and those of the Acquired Business and your and its respective subsidiaries, (d) make available to prospective Lenders your senior management and advisors and the senior management and advisors of the Acquired Business and your and its respective subsidiaries at times and locations mutually agreed upon, (e) host, with the Lead Arrangers, one or more meetings with prospective Lenders under each of the Facilities, at times and locations mutually agreed upon, (f) assist the Lead Arrangers in the preparation of one or more confidential information memoranda reasonably satisfactory to the Lead Arrangers and other marketing materials to be used in connection with the syndication of each of the Facilities and (g) obtain, at your expense, monitored public corporate credit/family ratings of Borrower and ratings of the Facilities and the Notes from Moody’s Investors Service (“Moody’s”) and Standard & Poor’s Ratings Group (“S&P”) (the “Ratings”) and to participate actively in the process of securing such ratings, including having your senior management and senior management of the Acquired Business meet with such rating agencies at times and locations mutually agreed upon.

At our request, you agree to prepare or cause to be prepared a version of the information package and presentation and other marketing materials to be used in connection with the syndication that do not contain material non-public information concerning Borrower or the Acquired Business, their respective affiliates or their securities. In addition, you agree that unless specifically labeled “Private — Contains Non-Public Information” by you prior to any dissemination of which you have reasonable prior notice to prospective Lenders in connection with the syndication of the Facilities, no information, documentation or other data disseminated to prospective Lenders in connection with the syndication of the Facilities, whether through an Internet website (including, without limitation, an IntraLinks workspace), electronically, in presentations at meetings or otherwise, will contain any material non-public information concerning Borrower or the Acquired Business, their respective affiliates or their securities.

Information.

You hereby represent and covenant that (but only to your knowledge with respect to information regarding the Acquired Business or any of its subsidiaries) (a) all written information (other than the Projections, other forward looking information and information of a general economic or industry nature) that has been or will be made available to us or any of the Lenders by you, the Acquired Business or any of your or its respective representatives in connection with the Transactions (the “Information”),

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when taken as a whole, when furnished, is and will be complete and correct in all material respects and does not and will not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements contained therein, in the light of the circumstances under which such statements are made, not materially misleading (after giving effect to all supplements and updates thereto so long as any such supplements and updates were made prior to the time of reliance on such Information by the Lead Arrangers) and (b) the Projections that have been or will be made available to us or any of the Lenders by you, the Acquired Business or any of your or its respective representatives in connection with the Transactions have been and will be prepared in good faith based upon assumptions believed by you to be reasonable at the time made (it being understood that projections by their nature are inherently uncertain, and are subject to uncertainties and contingencies, many of which are beyond your control, and no assurances are being given by you that the results reflected in the Projections will be achieved). You agree that if at any time prior to the Closing Date any of the representations in the preceding sentence would be incorrect if the Information and Projections were being furnished, and such representations were being made, at such time, then you will promptly supplement, or cause to be supplemented (or use commercially reasonable efforts to promptly supplement any Information or Projections in respect of the Acquired Business or any of its subsidiaries), the Information and Projections so that such representations will be correct at such time. You also agree to promptly advise us and the Lenders of all developments materially affecting Borrower, the Acquired Business, any of their respective subsidiaries or affiliates or the Transactions promptly after your becoming aware of such developments. In issuing the commitments hereunder and in arranging and syndicating the Facilities, we are and will be using and relying on the Information without independent verification thereof.

Compensation.

As consideration for the commitments of the Lenders hereunder with respect to the Facilities and the agreements of the Lead Arrangers to structure, arrange and syndicate the Facilities and to provide advisory services in connection therewith, you agree to pay, or cause to be paid, the fees set forth in the Term Sheets and the Fee Letter. Once paid, such fees shall not be refundable under any circumstances.

Conditions.

The commitments of the Initial Lenders hereunder with respect to each of the Facilities and the agreements of the Lead Arrangers to perform the services described herein may be terminated by the Lead Arrangers if (i) there has been any Material Adverse Effect (as defined below) on the Acquired Business and its Subsidiaries since January 2, 2011; or (ii) any condition set forth in either Term Sheet or the Conditions Annex is not satisfied; it being understood that there are no conditions (implied or otherwise) to the commitments hereunder (including compliance with the terms of the Commitment Letter, the Fee Letter and the Facilities Documentation) other than those that are expressly stated to be conditions to the commitments or the initial funding under the Facilities on the Closing Date (and upon satisfaction of such conditions, the initial funding under the Facilities shall occur, except as amounts funded thereunder may be reduced as a result of a Qualified Equity Offering or the offering of the Notes).

As used in this paragraph and the foregoing paragraph, (i) “Material Adverse Effect” means with respect to any Person, any change, effect, development or event that (a) has or would reasonably be expected to have a material adverse effect on the condition (financial or otherwise), business, assets or results of operations of such Person and its Subsidiaries, taken as a whole or (b) materially impairs the ability of such Person and its Subsidiaries to consummate, or prevents or materially delays, the Acquisition or any of the other transactions contemplated by the Acquisition Agreement or would reasonably be

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expected to do so; provided, however, that, subject to the last proviso of this sentence, in the case of clause (a) only, no changes, effects, developments or events resulting from, arising out of, or attributable to, any of the following shall be deemed to be or constitute a “Material Adverse Effect” or be taken into account when determining whether a “Material Adverse Effect” has occurred or may, would or could occur: (A) any changes, effects, developments or events in the economy or the financial, credit or securities markets in general (including changes in interest or exchange rates), (B) any changes, effects, developments or events in the industries in which such Person and its Subsidiaries operate, (C) any changes, effects, developments or events resulting from the announcement or pendency of the transactions contemplated by the Acquisition Agreement, the identity of the Borrower or the performance or compliance with the terms of the Acquisition Agreement (including, in each case, any loss of customers, suppliers or employees or any disruption in business relationships), (D) any failure, in and of itself, of such Person to meet internal forecasts, budgets or financial projections or fluctuations, in and of themselves, in the trading price or volume of such Person’s common stock (it being understood that the facts, event, circumstances or occurrences giving rise or contributing to such failure or fluctuations may be deemed to be, constitute, or be taken into account when determining the occurrence of, a Material Adverse Effect), (E) acts of God, natural disasters, calamities, national or international political or social conditions, including the engagement by any country in hostility (whether commenced before, on or after the date of the Acquisition Agreement, and whether or not pursuant to the declaration of a national emergency or war), or the occurrence of a military or terrorist attack, or (F) any changes in Applicable Law or GAAP (or any interpretation thereof); provided further, however, that, with respect to clauses (A), (B), (E), and (F), the impact of such changes, effects, developments or events is not materially and disproportionately adverse to such Person and its Subsidiaries; (ii) “Person” means an individual, corporation, partnership, limited liability company, association, trust or other entity or organization, including a government or political subdivision or an agency or instrumentality thereof; (iii) “Subsidiary” means, with respect to any Person, any entity of which securities or other ownership interests having ordinary voting power to elect a majority of the board of directors or other persons performing similar functions are at any time directly or indirectly owned by such Person; (iv) “Applicable Law” means, with respect to any Person, any federal, state or local law (statutory, common or otherwise), constitution, treaty, convention, ordinance, code, rule, regulation, order, injunction, judgment, decree, ruling or other similar requirement enacted, adopted, promulgated or applied by a Governmental Authority that is binding upon or applicable to such Person, its Subsidiaries or any of their respective assets, as the same may be amended from time to time unless expressly specified otherwise in the Acquisition Agreement; (v) “GAAP” means United States generally accepted accounting principles consistently applied; and (vi) “Governmental Authority” means any transnational, domestic or foreign federal, state or local governmental, regulatory or administrative authority, department, court, agency, commission or official, including any political subdivision thereof, or any non-governmental self-regulatory agency, commission or authority.

Notwithstanding anything in this Commitment Letter, the Fee Letter, the Financing Documentation or any other letter agreement or other undertaking concerning the financing of the Transactions to the contrary, (i) the only representations relating to the Borrower, the Acquired Business, its subsidiaries and its businesses the accuracy of which shall be a condition to availability of the Facilities on the Closing Date shall be (A) such of the representations made by the Acquired Business in the Acquisition Agreement as are material to the interests of the Lenders, but only to the extent that you (or Merger Sub) have the right to terminate your (or its) obligations under the Acquisition Agreement as a result of a breach of such representations in the Acquisition Agreement (the “Acquisition Agreement Representations”) and (B) the Specified Representations (as defined below) and (ii) the terms of the Financing Documentation shall be in a form such that they do not impair availability of the Facilities on the Closing Date if the conditions set forth in this Commitment Letter are satisfied. For purposes hereof, “Specified Representations” means the representations and warranties relating as to corporate power and authority,

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the due authorization, execution, delivery and enforceability of the Financing Documentation, the Financing Documentation not conflicting with charter documents or law, solvency, Federal Reserve margin regulations, validity, priority and perfection of security interests (subject to paragraph 2 of the Additional Bank Facilities Conditions section of the Conditions Annex), status of debt under the applicable Facility as senior debt, the Patriot Act and the Investment Company Act.

Clear Market.

From the date of this Commitment Letter until the earlier of (1) 90 days after the Closing Date and (2) a Successful Syndication of each of the Facilities and, if later, of the distribution of the Notes, you will ensure that no debt securities or bank financing for Borrower, the Acquired Business or any of your or its respective subsidiaries is announced, syndicated or placed without the prior written consent of the Lead Arrangers if such financing, syndication or placement would have, in the reasonable judgment of the Lead Arrangers, a detrimental effect upon the Transactions.

Indemnity and Expenses.

By your acceptance below, you hereby agree to indemnify and hold harmless the Commitment Parties and the other Lenders and their respective affiliates (including, without limitation, controlling persons) and the directors, officers, employees, advisors and agents of the foregoing (each, an “Indemnified Person”) from and against any and all losses, claims, costs, expenses, damages or liabilities (or actions or other proceedings commenced or threatened in respect thereof) that arise out of or in connection with this Commitment Letter, the Fee Letter, the Facilities or any of the Transactions or the providing or syndication of the Facilities (or the actual or proposed use of the proceeds thereof), and to reimburse each Indemnified Person promptly upon its written demand for any legal or other expenses incurred in connection with investigating, preparing to defend or defending against, or participating in, any such loss, claim, cost, expense, damage, liability or action or other proceeding; provided that any legal expenses shall be limited to the expenses of one counsel for all Indemnified Persons taken as a whole and a single local counsel for all Indemnified Persons taken as a whole in each relevant jurisdiction and, solely in the case of a conflict of interest, one additional counsel in each relevant jurisdiction to each group of affected Indemnified Persons similarly situated; provided, further, that any such obligation to indemnify, hold harmless and reimburse an Indemnified Person shall not be applicable (i) to the extent determined by a final, non-appealable judgment of a court of competent jurisdiction (a) to have resulted solely from the gross negligence or willful misconduct of such Indemnified Person or any Related Indemnified Person or (b) to have arisen from a material breach of the obligations of such Indemnified Person under this Commitment Letter or the Fee Letter or (ii) to any dispute solely among Indemnified Persons other than (x) any claims against any Commitment Party in its capacity or in fulfilling its role as an administrative agent or arranger or any similar role under any Facility and (y) any claims arising out of any act or omission on the part of you or your affiliates. In the case of an investigation, action or proceeding to which the indemnity in this paragraph applies, such indemnity and reimbursement obligations shall be effective whether or not such investigation, action or proceeding is brought by you, your equity holders or creditors or an Indemnified Person, whether or not an Indemnified Person is otherwise a party thereto and whether or not any aspect of the Commitment Letter, the Fee Letter, the Facilities or any of the Transactions is consummated. To the extent legally permitted to do so and to the extent doing so will not violate any confidentiality or contractual obligations applicable to it, each Commitment Party agrees to use commercially reasonable efforts to inform you of the existence of any actions or proceedings known to it that are brought against it with respect to which it will be seeking indemnification hereunder, provided that the failure to so inform you shall not in any way affect your indemnification obligations hereunder. You also agree that no Indemnified Person shall have any liability (whether direct or indirect, in contract, tort, equity

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or otherwise) to you or your subsidiaries or affiliates or to your or their respective equity holders or creditors arising out of, related to or in connection with any aspect of the Commitment Letter, the Fee Letter, the Facilities or any of the Transactions, except to the extent of direct (as opposed to special, indirect, consequential or punitive) damages determined in a final non-appealable judgment by a court of competent jurisdiction to have resulted from such Indemnified Person’s or any of its Related Indemnified Person’s gross negligence or willful misconduct. It is further agreed that the Commitment Parties shall have liability only to you (as opposed to any other person), and that each Initial Lender shall be liable solely in respect of its own commitment to the Facilities on a several, and not joint, basis with any other Lender. We agree that none of you and your subsidiaries, directors, officers, employees, advisors and agents shall be liable to us for any special, indirect, consequential or punitive damages arising from the Facilities; provided however that the foregoing shall not in any way limit your indemnification obligations to any Indemnified Person. Notwithstanding any other provision of this Commitment Letter, no Indemnified Person shall be liable for any damages arising from the use by others of information or other materials obtained through electronic telecommunications or other information transmission systems, other than for direct or actual damages resulting from the gross negligence or willful misconduct of such Indemnified Person or any of its Related Indemnified Persons as determined by a final and non-appealable judgment of a court of competent jurisdiction. You shall not, without the prior written consent of any Indemnified Person (which consent shall not be unreasonably withheld or delayed), effect any settlement of any pending or threatened proceeding in respect of which such Indemnified Person is or could have been a party and indemnity could have been sought hereunder by such Indemnified Person, unless such settlement (i) includes an unconditional release of such Indemnified Person from all liability or 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 such Indemnified Person; provided, that it is expressly agreed that we may withhold our consent to any settlement that does not satisfy the conditions set forth in (i) and (ii) of this sentence. In addition, if the Closing Date occurs, you hereby agree to reimburse us and each of the Lenders from time to time upon demand for all reasonable and documented out-of-pocket expenses (including, without limitation, reasonable legal fees and expenses of the counsel to the Commitment Parties identified in the Term Sheets and of a single local counsel to the Commitment Parties in each jurisdiction determined to be reasonably necessary or advisable by the Commitment Parties, appraisal, consulting and audit fees, and printing, reproduction, document delivery, travel, communication and publicity costs) incurred in connection with the syndication and execution of the Facilities, and the preparation, review, negotiation, execution and delivery of this Commitment Letter, the Fee Letter, the Financing Documentation and the administration, amendment, modification or waiver thereof (or any proposed amendment, modification or waiver).

For purposes hereof, a “Related Indemnified Person” of an Indemnified Person means (i) any controlling person or controlled affiliate of such Indemnified Person and (ii) the respective directors, officers, or employees of such Indemnified Person or any of its controlling persons or controlled affiliates; provided that each reference to a controlled affiliate or controlling person in this sentence pertains to a controlled affiliate or controlling person involved in the negotiation of this Commitment Letter or the syndication of the Facilities.

Confidentiality.

This Commitment Letter is delivered to you upon the condition that neither the existence of this Commitment Letter or the Fee Letter nor any of their contents shall be disclosed by you or any of your affiliates, directly or indirectly, to any other person, except that (i) such existence and contents may be disclosed (a) as may be compelled in a judicial or administrative proceeding or as otherwise required by law (including as required by the rules, regulations, schedules and forms of the Securities and

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Exchange Commission (the “SEC”) in connection with any filings made with the SEC in connection with the Transactions; provided, however, that it is agreed that the Fee Letter will not be filed with the SEC in connection with any such disclosure without our prior written consent), or as requested by a governmental authority (in which case, to the extent permitted by law, rule or regulation, you agree to inform us promptly thereof), (b) to your directors, officers, employees, legal counsel and accountants, in each case on a confidential and “need-to-know” basis and only in connection with the Transactions and (c) as provided in a written consent from the Commitment Parties, (ii) the Term Sheets and the existence of this Commitment Letter (but not this Commitment Letter, the contents of this Commitment Letter, the Fee Letter or the contents of the Fee Letter) may be disclosed to any rating agency in connection with the Transactions and (iii) you may disclose, on a confidential basis, the aggregate amount of the fees (including upfront fees and original issue discount) payable under the Fee Letter as part of generic disclosure regarding sources and uses (but without disclosing any specific fees set forth therein) in connection with any syndication of the Facilities or prospectus or offering memorandum related to the Notes (or any debt securities or loans issued pursuant to, or as contemplated by, the Fee Letter). In addition, this Commitment Letter and, so long as redacted in a manner reasonably acceptable to the Commitment Parties, the Fee Letter may be disclosed to the Acquired Business and its directors, officers, employees, advisors and agents, in each case on a confidential and “need-to-know” basis and only in connection with the Transactions.

Each Commitment Party will use all confidential information provided to it by or on behalf of you hereunder solely for the purpose of providing the services which are the subject of this Commitment Letter or other services agreed in writing and shall treat confidentially all such information; provided that nothing herein shall prevent a Commitment Party from disclosing any such information (i) pursuant to the order of any court or administrative agency or otherwise as required by applicable law or regulation or as requested by a governmental authority (in which case such Commitment Party, to the extent permitted by law, rule or regulation, agrees to inform you reasonably promptly thereof), (ii) upon the request or demand of any regulatory authority (including any self-regulatory authority) having jurisdiction over such Commitment Party or any of its affiliates (in which case such Commitment Party agrees to inform you promptly thereof prior to such disclosure, unless such Commitment Party is prohibited by applicable law from so informing you, or except in connection with any request as part of a regulatory examination), (iii) to the extent that such information becomes publicly available other than by reason of a breach of this paragraph, (iv) to the extent that such information is received by such Commitment Party from a third party that is not to such Commitment Party’s knowledge subject to confidentiality obligations to you, (v) to the extent that such information is independently developed by such Commitment Party or any of its affiliates, (vi) to such Commitment Party’s affiliates and its partners, officers, directors, employees, legal counsel, advisors, independent auditors and other experts, agents or representatives who are informed of the confidential nature of such information, (vii) to prospective Lenders, participants or assignees or any potential counterparty (or its advisors) to any swap or derivative transaction relating to the Borrower or any of its subsidiaries or any of their respective obligations, in each case who agree to be bound by the terms of this paragraph (or language substantially similar to this paragraph), (viii) for purposes of establishing a “due diligence” defense; (ix) to ratings agencies; (x) to any other party hereto; (xi) in connection with the exercise of any remedies hereunder or under any other Financing Documentation or any action or proceeding relating to this Commitment Letter or the Fee Letter or any other Financing Documentation or the enforcement of rights hereunder or thereunder; or (xii) with your consent. Each Commitment Party’s obligations under this paragraph shall automatically terminate and be superseded by the confidentiality provisions in Financing Documentation upon the execution and delivery thereof and in any event shall terminate one year from the date hereof.

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Other Services.

You acknowledge and agree that we and/or our affiliates may be requested to provide additional services with respect to Borrower, the Acquired Business and/or their respective affiliates or other matters contemplated hereby. Any such services will be set out in and governed by a separate agreement(s) (containing terms relating, without limitation, to services, fees and indemnification) in form and substance satisfactory to the parties thereto. Nothing in this Commitment Letter is intended to obligate or commit us or any of our affiliates to provide any services other than as set out herein.

No Fiduciary Relationship.

You hereby acknowledge that we are acting solely as agents, lenders, bookrunners or arrangers, as applicable, in connection with the Facilities. You further acknowledge that we are acting pursuant to a contractual relationship created by this Commitment Letter that was entered into on an arm’s length basis and in no event do the parties intend that any of us act or be responsible as a fiduciary to you or any of your subsidiaries, your stockholders or creditors or any other person in connection with any activity that we may undertake or have undertaken in furtherance of the Facilities, either before or after the date hereof. We hereby expressly disclaim any fiduciary or similar obligations to any such person, either in connection with the Facilities or this Commitment Letter or any matters leading up to either, and you hereby confirm your understanding and agreement to that effect. Each of you and we agree that you and we are each responsible for making our own independent judgments with respect to the Facilities, and that any opinions or views expressed by us to you regarding the Transactions, including but not limited to any opinions or views with respect to the price or market for your or your subsidiaries’ debt, do not constitute advice or recommendations to you or any of your subsidiaries. You, on behalf of yourself and your subsidiaries, hereby waive and release, to the fullest extent permitted by law, any claims that you or any of your subsidiaries may have against us with respect to any breach or alleged breach of any fiduciary or similar duty in connection with the Transactions or any matters leading up to the execution of this Commitment Letter or the Financing Documentation.

Governing Law, Etc.

This Commitment Letter and the commitment of the Lenders shall not be assignable by you without the prior written consent of us and the Lenders, and any purported assignment without such consent shall be void. We reserve the right to employ the services of our affiliates in providing services contemplated by this Commitment Letter and to allocate, in whole or in part, to our affiliates certain fees payable to us in such manner as we and our affiliates may agree in our sole discretion. You also agree that each Initial Lender may at any time and from time to time assign all or any portion of its respective commitments hereunder to one or more of its respective affiliates; provided the Initial Lenders will not be relieved of all or any portion of their commitments hereunder prior to the Closing Date unless agreed in writing by you. The rights of each of the Lead Arrangers in their capacity as such shall be retained exclusively by such Lead Arranger or its affiliates. Such rights may not be, directly or indirectly, encumbered or assigned in any manner to any other person (other than its affiliates) without the consent of each other Lead Arranger. You further acknowledge that we may share with any of our affiliates, and such affiliates may share with us, any information related to Borrower, the Acquired Business, or any of your or its respective subsidiaries or affiliates (including, without limitation, information relating to creditworthiness) and the Transactions. We agree to treat, and cause any such affiliate to treat, all non-public information provided to us by you as confidential information in accordance with the section entitled “Confidentiality” above.

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This Commitment Letter and the Fee Letter constitute the entire contract among the parties relating to the subject matter hereof and supersede any and all previous agreements and understandings, oral or written, relating to the subject matter hereof. No party has been authorized by any Commitment Party to make any oral or written statements or agreements that are inconsistent with this Commitment Letter and the Fee Letter. This Commitment Letter may not be amended or any provision hereof waived or modified except by an instrument in writing signed by us and you. This Commitment Letter may be executed in any number of counterparts, each of which shall be an original and all of which, when taken together, shall constitute one agreement. Delivery of an executed counterpart of a signature page of this Commitment Letter by facsimile transmission or other electronic transmission (i.e., a “pdf” or “tif”) shall be effective as delivery of a manually executed counterpart of this Commitment Letter. Headings are for convenience of reference only and shall not affect the construction of, or be taken into consideration when interpreting, this Commitment Letter. This Commitment Letter is intended to be for the benefit of the parties hereto and is not intended to confer any benefits upon, or create any rights in favor of, and may not be relied on by, any persons other than the parties hereto, the Lenders and, with respect to the indemnification provided under the heading “Indemnity and Expenses,” each Indemnified Person.

This Commitment Letter shall be governed by, and construed in accordance with, the laws of the State of New York without regard to principles of conflicts of law to the extent that the application of the laws of another jurisdiction will be required thereby. Any right to trial by jury with respect to any claim or action arising out of this Commitment Letter is hereby waived. You hereby submit to the exclusive jurisdiction of the federal and New York State courts located in The City of New York (and appellate courts thereof) in connection with any dispute related to this Commitment Letter, the Fee Letter or any of the matters contemplated hereby or thereby, and agree that service of any process, summons, notice or document by registered mail addressed to you shall be effective service of process against you for any suit, action or proceeding relating to any such dispute. You irrevocably and unconditionally waive any objection to the laying of such venue of any such suit, action or proceeding brought in any such court and any claim that any such suit, action or proceeding has been brought in an inconvenient forum. Each of the parties hereto agrees that a final judgment in any such suit, action or proceeding may be enforced in any other jurisdiction by suit on the judgment or in any other manner provided by law.

Patriot Act.

We hereby notify you that pursuant to the requirements of the USA Patriot Act, Title III of Pub. L. 107-56 (signed into law October 26, 2001) (the “Patriot Act”), we and the other Lenders may be required to obtain, verify and record information that identifies Borrower and the Acquired Business, which information includes the name, address and tax identification number and other information regarding them that will allow us or such Lender to identify them in accordance with the Patriot Act. This notice is given in accordance with the requirements of the Patriot Act and is effective as to us and the Lenders.

Please indicate your acceptance of the terms of this Commitment Letter and the Fee Letter by returning to us executed counterparts of this Commitment Letter and the Fee Letter prior to 2:00 a.m., Los Angeles time, on April 4, 2011 (the “Deadline”). This Commitment Letter and the commitments of the Lenders hereunder and the agreement of the Lead Arrangers to provide the services described herein are also conditioned upon your acceptance of this Commitment Letter and the Fee Letter, and our receipt of executed counterparts hereof and thereof prior to the Deadline. Upon the earliest to occur of (A) the execution and delivery of the Financing Documentation by all of the parties thereto, (B) September 30, 2011, if the Financing Documentation shall not have been executed and delivered by all such parties, and the initial borrowings thereunder shall not have occurred, prior to that date and (C) if

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earlier than the date set forth in clause (B), the date of termination of the Acquisition Agreement, the commitments of the Lenders hereunder and the agreement of the Lead Arrangers to provide the services described herein shall automatically terminate unless the Lenders and the Lead Arrangers shall, in their discretion, agree to an extension. The compensation, expense reimbursement, confidentiality, indemnification and governing law and forum provisions in this Commitment Letter and the Fee Letter shall survive termination of any or all of the commitments of the Lenders hereunder. The provisions under the headings “Syndication” and “Clear Market” above shall survive the execution and delivery of the Financing Documentation.

[Signature Page Follows]

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We are pleased to have been given the opportunity to assist you in connection with the financing for the Transactions.

Bank and Bridge Facilities Commitment Letter

Bank and Bridge Facilities Commitment Letter

Accepted and agreed to as of the date first written above:

Bank and Bridge Facilities Commitment Letter

ANNEX I

BANK FACILITIES

SUMMARY OF PRINCIPAL TERMS AND CONDITIONS¹

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ANNEX II

BRIDGE FACILITY

SUMMARY OF PRINCIPAL TERMS AND CONDITIONS¹

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Exhibit A to

ANNEX II

Summary of Principal Terms and Conditions

of Exchange Notes

Capitalized terms used but not defined herein have the meanings given (or incorporated by reference) in the Summary of Principal Terms and Conditions of the Bridge Facility to which this Exhibit A is attached.

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ANNEX III

CONDITIONS TO CLOSING¹

The commitment of the Lenders under the Commitment Letter with respect to each of the Facilities, the agreements of the Commitment Parties to perform the services described in the Commitment Letter, the consummation of the Transactions and the funding of the Facilities are subject to the conditions set forth in the Commitment Letter and satisfaction of each of the conditions precedent set forth immediately below in items (1) through (7).

1. The Commitment Parties shall have reviewed, and be satisfied with, the Acquisition Agreement and the disclosure schedules and exhibits thereto (it being understood that the Commitment Parties are satisfied with the final draft of the Acquisition Agreement, final draft of the disclosure schedules and final draft of the exhibits, in each case received by counsel to the Lead Arrangers at 8:25 p.m. Pacific time on April 3, 2011). The Acquisition and the other Transactions shall be consummated substantially concurrently with the initial funding of the Facilities in accordance with the foregoing final draft of the Acquisition Agreement, without any waiver or amendment thereof or any consent thereunder that would materially adversely affect the Commitment Parties (it being understood and agreed that (a) any change in the purchase price and/or (b) any waiver or amendment of any condition contained therein regarding any rejection or disapproval by the SEC of any of the material terms or conditions of that certain Offer of Settlement of the Acquired Business executed by the Acquired Business on March 18, 2011, is deemed to materially adversely affect the Commitment Parties) unless consented to by the Commitment Parties. Immediately following the Transactions, neither Borrower nor any of its subsidiaries (including, for the avoidance of doubt, the Acquired Business and its subsidiaries) shall have any indebtedness or preferred equity other than certain limited indebtedness to be agreed, and no default shall exist under any material indebtedness of Borrower or any of its subsidiaries. The Commitment Parties shall have received reasonably satisfactory evidence of repayment of all indebtedness to be repaid on the Closing Date and the discharge (or the making of arrangements for discharge) of all liens other than liens permitted to remain outstanding under the Financing Documentation.

2. The Commitment Parties shall have received (i) promptly after available, audited consolidated balance sheets and related statements of income, stockholders’ equity and cash flows of (x) Borrower for each of the last three fiscal years ending December 31, 2010 and (y) the Acquired Business for each of the last three fiscal years ending more than 60 days prior to the Closing Date (the “Audited Financial Statements”), (ii) promptly after available and in any event within 45 days after the end of each fiscal quarter since the date of the most recent audit for each of the Borrower and the Acquired Business, unaudited consolidated balance sheets and related statements of income and cash flows of each of Borrower and the Acquired Business for such fiscal quarter, for the period elapsed from the beginning of the most recent fiscal year to the end of such fiscal quarter and for the comparable periods of the preceding fiscal year (the “Unaudited Financial Statements”) (with respect to which the independent auditors shall have performed an SAS 100 review), (iii) a pro forma consolidated and consolidating balance sheet and related statements of income and cash flows for Borrower (the “Pro Forma Financial Statements”), as well as pro forma levels of EBITDA (“Pro Forma EBITDA”), for the last fiscal year covered by the

Audited Financial Statements and for the latest four-quarter period ending with the latest period covered by the Unaudited Financial Statements, promptly after the historical financial statements for such periods are available, in each case after giving effect to the Transactions and (iv) forecasts of the financial performance of Borrower and its subsidiaries (x) on an annual basis, through 2018 and (y) on a quarterly basis for the next eight quarters. The financial statements referred to in clauses (i) and (ii) shall be prepared in accordance with accounting principles generally accepted in the United States. The Pro Forma Financial Statements shall be prepared on a basis consistent with pro forma financial statements set forth in a registration statement filed with the SEC.

3. To the extent required by the Acquisition Agreement, all necessary governmental and material third party approvals in connection with the Transactions shall have been obtained and shall be in effect or any such requirement shall be waived in accordance with the Acquisition Agreement (other than any such approvals, the failure of which to obtain could not reasonably be expected to materially adversely affect (in the Commitment Parties’ reasonable determination) the interests of the Commitment Parties or as approved in writing by the Commitment Parties). Without limiting the foregoing, to the extent required by the Acquisition Agreement, all requisite shareholder approvals and consents required by applicable law or the transactional documents with respect to the Acquisition Agreement and the governing documents of Borrower necessary to effect the merger contemplated by the Acquisition Agreement shall have been obtained and shall be in full force and effect.

4. The Lenders shall have received all opinions, certificates and closing documentation customarily delivered to lenders for transactions of this type as the Commitment Parties shall reasonably request, in form and substance reasonably satisfactory to the Commitment Parties, including but not limited to a solvency certificate in substance reasonably satisfactory to the Lenders and substantially in the form attached as Annex IV or, in lieu thereof, at the option of Borrower, a solvency opinion from a nationally recognized valuation firm.

5. At least five business days prior to the Closing Date, Borrower and each of the Guarantors shall have provided the documentation and other information to the Lenders that is required by regulatory authorities under applicable “know your customer” and anti-money-laundering rules and regulations, including, without limitation, the Patriot Act.

6. All costs, fees, expenses (including, without limitation, legal fees and expenses and the fees and expenses of appraisers, consultants and other advisors) and other compensation payable to the Lenders, the Commitment Parties, the Administrative Agent or the Collateral Agent shall have been paid to the extent due.

7. All of the requirements referred to in the Commitment Letter under “Syndication” shall have been satisfied, the Closing Date shall not occur less than 25 consecutive days after the delivery to the Lead Arrangers of the final confidential information memorandum referred to therein and the Borrower shall have obtained the Ratings prior to the commencement of such consecutive 25 day period; provided that such consecutive 25 day period must either (a) end on or prior to June 30, 2011, (b) begin on or after July 5, 2011 and end on or prior to August 19, 2011 or (c) begin on or after September 6, 2011 and end on or prior to September 27, 2011; provided further that, notwithstanding the foregoing, such 25 consecutive day period referred to above shall be reduced to (x) 15 consecutive business days solely with respect to a syndication of the Facilities beginning on July 5, 2011 so long as the Lead Arrangers have received such a final confidential information memorandum by June 28, 2011 and (y) 22 consecutive days solely with respect to the period set forth in the preceding clause (c).

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Additional Bank Facilities Conditions

In addition, the commitment of the Lenders under the Commitment Letter with respect to the Bank Facilities and the funding of the Bank Facilities are subject to the following additional conditions precedent set forth below.

1. Prior to or concurrently with the initial borrowings under the Bank Facilities, Borrower shall have received gross proceeds of $200.0 million either from the issuance and sale of the Notes or from borrowings under the Bridge Facility (as such amount may be reduced by underwriting fees or any issuance of the Notes with original issue discount).

2. All documents and instruments required to perfect the Collateral Agent’s security interest in the collateral described under the heading “Security” in the Bank Term Sheet shall have been executed and delivered and, if applicable, be in proper form for filing, and none of such collateral shall be subject to any other pledges, security interests or mortgages, except customary permitted liens and other limited exceptions permitted under the Bank Documentation; provided, however, that, with respect to any such collateral the security interest in which may not be perfected by filing of an intellectual property security agreement with the relevant United States patent, trademark or copyright office, filing of a UCC financing statement, or possession of such collateral, if the perfection of the Collateral Agent’s security interest in such collateral may not be accomplished prior to the Closing Date without undue burden or expense or after your use of commercially reasonable efforts to do so, then delivery of documents and instruments for perfection of such security interest shall not constitute a condition precedent to the initial borrowings under the Bank Facilities if Borrower agrees to deliver or cause to be delivered such documents and instruments, and take or cause to be taken such other actions as may be required to perfect such security interests, within a period after the Closing Date reasonably acceptable to the Commitment Parties.

Additional Bridge Facility Conditions

In addition, the commitment of the Lenders under the Commitment Letter with respect to the Bridge Facility and the funding of the Bridge Facility are subject to the following additional conditions precedent set forth below.

1. Prior to or concurrently with the borrowings under the Bridge Facility, the Bank Documentation shall have been executed and delivered, and Borrower shall have received aggregate gross proceeds of $190.0 million from borrowings under the Term Loan Facility (as such amount may be reduced due to a Qualified Equity Offering or any permitted original issue discount).

2. Borrower shall have engaged the Investment Bank referred to in the Fee Letter to place the Securities referred to therein. The Borrower shall have complied with the provisions under the captions “Take-out Financing” and, if a Take-out Demand is delivered, “Take-out Demand”, in the Fee Letter. Without limitation of the foregoing, Borrower shall have (i) prepared a customary preliminary prospectus, offering memorandum or private placement memorandum (all as determined by, and in a form reasonably satisfactory to, the Investment Bank but in any event including all financial statements and other information that would be required in a registration statement on Form S-1 for an offering registered under the Securities Act) except, in the event the Securities will not be offered and sold in a registered offering, for a consolidating footnote to the financial statements for guarantors and non-guarantors and any other exceptions customary for a Rule 144A offering) relating to the Notes, and thereafter prepared supplements to or a final version of such prospectus, offering memorandum or private placement

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memorandum (promptly upon request by, and in a form reasonably satisfactory to, the Investment Bank) (collectively, the “Offering Document”) and delivered such Offering Document not less than 25 consecutive days prior to the Closing Date (it being understood that (A) if any of the financial information in the Offering Document becomes “stale” under the applicable provisions of Regulation S-X during any such 25 consecutive day period, then such period shall be deemed not to have occurred and a new 25 consecutive day period shall only commence upon delivery of an Offering Document that does not contain any such “stale” financial information and (B) the consecutive 25 day period must either (a) end on or prior to June 30, 2011, (b) begin on or after July 5, 2011 and end on or prior to August 19, 2011 or (c) begin on or after September 6, 2011 and end on or prior to September 27, 2011; provided that, notwithstanding the foregoing, such 25 consecutive day period shall be reduced to 22 consecutive days solely with respect to the period set forth in the preceding clause (c)), (ii) delivered customary “comfort letters” (including customary “negative assurances”) from the independent registered public accountants of Borrower and the Acquired Business with respect to the financial information of Borrower and the Acquired Business contained in the Offering Document, (iii) caused the senior management and other representatives of Borrower and the Acquired Business to provide access in connection with due diligence investigations and to participate in a customary high-yield “road show,” for a consecutive 25 day period commencing on the date of delivery of a final Offering Document (at no time during which period the financial information in the Offering Document shall be “stale”) (provided that such consecutive 25 day period must either (a) end on or prior to June 30, 2011, (b) begin on or after July 5, 2011 and end on or prior to August 19, 2011 or (c) begin on or after September 6, 2011 and end on or prior to September 27, 2011; provided that, notwithstanding the foregoing, such 25 consecutive day period shall be reduced to (x) 15 consecutive business days solely with respect to a roadshow beginning on July 5, 2011 so long as the Lead Arrangers have received such a final Offering Document by June 28, 2011 and (y) 22 consecutive days solely with respect to the period set forth in the preceding clause (c)) and (iv) the Borrower shall have obtained the Ratings in respect of the Notes prior to the commencement of such consecutive 25 day period (or such consecutive 22 day period solely with respect the preceding clause (c)). To the extent the Take-out Financing is not consummated on or prior to the Closing Date, this condition shall continue as a covenant following the Closing Date (with the references to specific dates and periods being updated and disregarded as necessary).

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ANNEX IV

FORM OF SOLVENCY CERTIFICATE

for

DUCOMMUN INCORPORATED

AND ITS SUBSIDIARIES

                    , 2011

Pursuant to Section [    ] of the [insert description of credit agreement] (as amended, restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), the undersigned hereby certifies, solely in its capacity as chief financial officer of Borrower, and not individually, as follows:

For purposes of this certificate, the amount of any contingent liability at anytime shall be computed as the amount that would reasonably be expected to become an actual and matured liability, and any subrogation and/or contribution rights will be considered in determining the amount of such liability.

[Signature Page Follows]

IN WITNESS WHEREOF, the undersigned has executed this Certificate in its capacity as chief financial officer of Borrower, on behalf of Borrower, as of the date first stated above.

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