ATK Receives $38 Million Award to Produce LW30mm Ammunition for Apache AH-64 Helicopters

Contract Options Could Increase Total Value to Approximately $63 Million

Minneapolis, August 11, 2006 – Alliant Techsystems (NYSE: ATK) has received a $38 million contract modification from the Joint Munitions Command, Rock Island, Illinois, to produce light weight 30mm High Explosive, Dual Purpose (LW30 HEDP) ammunition for use on the Apache AH-64 helicopter. If all contract options are exercised, the total contract value could exceed $63 million.

The LW30mm rounds are fired from ATK’s M230 Gun System, which is mounted under the nose of the Apache AH-64. With LW30 HEDP ammunition, the Apache is capable of defeating a wide range of targets including light armor vehicles and tanks.

“The combination of ATK’s LW30 ammunition and the company’s M230 Chain Gun offer Apache air crews an exceptional weapon system for battlefield superiority,” said Jim Cates, Vice President and General Manager ATK Medium Caliber Systems. “We’re proud to provide the Apache with the firepower it needs to complete the mission.”

ATK is a $3.4 billion advanced weapon and space systems company employing approximately 15,000 people in 22 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, 2006.

Contact Information

Bryce Hallowell

Alliant Techsystems

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