ATK Awarded Contract Totaling $43.5 Million for Mk 90 Rocket Propellant

Total Potential Value is $190 Million

Contract Provides ATK with Multi-year Business at the Radford Army Ammunition Plant

Minneapolis, December 12, 2005 – Alliant Techsystems (NYSE: ATK), the nation’s largest manufacturer of ammunition, was recently awarded a $43.5 million contract by General Dynamics (NYSE: GD) for continued production of Mk 90 rocket propellant grains at the Radford Army Ammunition Plant (RAAP) in Radford, Virginia. The multi-year award is expected to result in a total contract value of approximately $190 million.

The rocket propellant grains are used in the Mk 90 HYDRA-70 2.75-inch rocket, the most widely used helicopter weapon system in the world.

ATK is a $3.1 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 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.

Contact Information

Bryce Hallowell

ATK Corporate Communications

Alliant Techsystems

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