FIRST SUPPLEMENTAL INDENTURE

FIRST SUPPLEMENTAL INDENTURE, dated as of October 26, 2004 (this “ First Supplemental Indenture ”), to that certain Indenture, dated as of August 13, 2004 (the “ Indenture ”), among ALLIANT TECHSYSTEMS INC., a Delaware corporation (the “ Company ”), BNY MID WEST TRUST COMPANY, an Illinois banking corporation, as trustee under the Indenture (the “ Trustee ”), and acknowledged by AEC- ABLE ENGINEERING COMPANY, INC., a California corporation, ATK COMMERCIAL AMMUNITION COMPANY INC., a Delaware corporation, ATK ELKTON, LLC, a Delaware limited liability company, ATK INTERNATIONAL SALES INC., a Delaware corporation, ATK MISSILE SYSTEMS COMPANY LLC, a Delaware limited liability company, ATK ORDNANCE GROUND SYSTEMS LLC, a Delaware limited liability company, ATK TACTICAL SYSTEMS COMPANY LLC, a Delaware limited liability company, ATK THIOKOL, a Delaware corporation, ALLIANT AMMUNITION SYSTEMS COMPANY LLC, a Delaware limited liability company, ALLIANT AMMUNITION AND POWDER COMPANY LLC, a Delaware limited liability company, ALLIANT HOLDINGS LLC, a Delaware limited liability company, ALLIANT LAKE CITY SMALL CALIBER AMMUNITION COMPANY LLC, a Delaware limited liability company, ALLIANT SOUTHERN COMPOSITES COMPANY LLC, a Delaware limited liability company, AMMUNITION ACCESSORIES INC., a Delaware corporation, COMPOSITE OPTICS, INCORPORATED, a California corporation, FEDERAL CARTRIDGE COMPANY, a Minnesota corporation, GASL, INC., a New York corporation, MICRO CRAFT INC., a Tennessee corporation, MISSION RESEARCH CORPORATION, a California corporation, NEW RIVER ENERGETICS, INC., a Delaware corporation, PRESSURE SYSTEMS, INC., a Delaware corporation, PROGRAMMED COMPOSITES INC., a Delaware corporation, THIOKOL TECHNOLOGIES INTERNATIONAL, INC., a Delaware corporation (each a “ Subsidiary Guarantor ” and collectively, the “ Subsidiary Guarantors ”).  All terms used herein and not otherwise defined herein shall have the same respective meanings as in the Indenture.

R E C I T A L S:

A.             The Company has issued and outstanding, pursuant to the Indenture, $200 million aggregate principal amount of 3.00% Convertible Senior Subordinated Notes due August 15, 2024 (the “ Notes ”);

B.             Section 15.02(g) of the Indenture provides that the Company may satisfy its Conversion Obligations either solely in cash or solely in shares of Company Common Stock, and that the Company may at any time prior to the Stated Maturity, elect to amend the Indenture to require the Company to satisfy 100% of the Conversion Obligations with respect to the principal amount of the Notes converted after the date of such election solely in cash, with any remaining amount of the Conversion Obligations to be satisfied, at the Company’s sole option, in cash, shares of Common Stock or a combination of cash and Common Stock (such election option pursuant to 15.02(g) of the Indenture, referred to hereinafter as, the “ Payment Option ”);

C.             The Company desires and has requested the Trustee to join with the Company in the execution and delivery of this First Supplemental Indenture for the purpose of amending the I