SUPPLEMENTAL INDENTURE

Exhibit 4(t)

SUPPLEMENTAL INDENTURE

THIS SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”) dated as of December 20, 2002, is by and among Litton Industries, Inc., a Delaware corporation (“Litton”), The Bank of New York, a New York banking corporation, as trustee (“Trustee”), Northrop Grumman Corporation, a Delaware corporation, (“NGC”), and Northrop Grumman Systems Corporation, a Delaware corporation, (“NGSC”). Capitalized terms used but not defined herein shall have the meanings assigned to such terms in the Senior Indenture (as defined below).

WHEREAS, Litton and the Trustee are parties to that certain Senior Indenture dated as of December 15, 1991 between Litton and the Trustee (as supplemented and/or amended to date, the “Senior Indenture”), providing for the issuance from time to time of Litton’s unsecured debentures, notes or other evidences of indebtedness to be issued in one or more series as might be determined by Litton under the Senior Indenture;

WHEREAS, Litton has issued its 7.75% Debentures due 2026 and its 6.98% Debentures due 2036 pursuant to the terms of the Senior Indenture (the “Securities”);

WHEREAS, NGSC and Litton are each wholly-owned subsidiaries of NGC;

WHEREAS, NGC desires to simplify its organizational structure by merging Litton into NGSC pursuant to Section 251 of the Delaware General Corporation Law (the “Merger”) on or about 12:01 a.m. on January 1, 2003;

WHEREAS, NGC has guaranteed the obligations of Litton under the Senior Indenture and desires that such guarantee continue following the merger of Litton into NGSC;

NOW, THEREFORE, NGC, NGSC and Litton covenant and agree to and with the Trustee, for the equal and proportionate benefit of all present and future Holders of the Securities, as follows:

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IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed as of December 20, 2002.

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