ATK Awarded $76 Million Contract for Trident II Solid Propulsion

Alliant Techsystems has received a $76 million contract from Lockheed Martin to produce solid propulsion systems for all three stages of the U.S. Navy’s Trident II (D-5) Fleet Ballistic Missile (FBM).

Under terms of the contract, ATK will continue to supply Trident solid propulsion systems to the Trident II (D-5) Missile System Prime Contractor, Lockheed Martin Space Systems Company, Sunnyvale, Calif. through 2010. Trident II (D-5) is the only U.S. submarine-launched strategic missile system in production today. It was first deployed in 1990 and is planned for continuous deployment to 2042.

ATK is the world’s leading supplier of solid rocket motors. It has a 50-year history of producing solid propulsion systems for submarine-launched ballistic missiles, beginning with the Polaris missile and continuing through the Trident II (D-5) FBM. The company’s solid rocket portfolio ranges from 3-inch diameter spin motors to the Space Shuttle’s Reusable Solid Rocket Motors (RSRM).

ATK is a $3.3 billion advanced weapon and space systems company employing approximately 15,000 people in 23 states. News and information can be found on the Internet at http://www.atk.com .

Certain information discussed in this press release constitutes forward- looking statements as defined in the Private Securities Litigation Reform Act of 1995. Although ATK believes that the expectations reflected in such forward-looking statements are based on reasonable assumptions, it can give no assurance that its expectations will be achieved. Forward-looking information is subject to certain risks, trends and uncertainties that could cause actual results to differ materially from those projected. Among those factors are: changes in governmental spending, budgetary policies and product sourcing strategies; the company’s competitive environment; the terms and timing of awards and contracts; and economic conditions. ATK undertakes no obligation to update any forward-looking statements. For further information on factors that could impact ATK, and statements contained herein, reference should be made to ATK’s filings with the Securities and Exchange Commission, including quarterly reports on Form 10-Q, current reports on Form 8-K, and ATK’s Annual Report on Form 10-K for the fiscal year ended March 31, 2005.