ATK under Contract for Counter-IED Program

ATK SCORPION II WILL BE A TRANSPORTABLE HIGH-POWERED MICROWAVE SYSTEM Minneapolis, June 17, 2005 – Alliant Techsystems (NYSE: ATK) has received a $1.5 million contract from the U.S. Air Force Research Laboratory (AFRL) to build and test the Scorpion II Demonstration System, a transportable high-powered microwave system capable of disabling a wide variety of improvised explosive devices (IEDs). Under terms of the contract, the AFRL’s Directed Energy Directorate, High Power Microwave Division will work closely with ATK to develop the system. In previous tests with Scorpion I, ATK and the AFRL built, tested and fielded a high-powered microwave system that pre-detonated a wide variety of IEDs it encountered in realistic test scenarios, based on U.S. experience in Iraq. The AFRL specifically cited the team’s “superb ingenuity” that led to a first-ever high-power microwave system that was ruggedized for transport. According to the AFRL, Scorpion I demonstrated “the best result to be achieved by any system to date.” ATK’s Scorpion II is a rapid development program, reflecting the Department of Defense’s desire to develop force protection systems that can be deployed and used in the global war on terror. ATK is a $3.0 billion advanced weapon and space systems company employing approximately 14,000 people in 23 states. News and information can be found on the Internet at 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: the challenges of developing advanced technologies, changes in governmental spending and budgetary policies, economic conditions, the company's competitive environment, the timing of awards and contracts, and program performance. ATK undertakes no obligation to update any forward-looking statements. For further information on factors that could impact ATK, and the 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 annual reports on Form 10-K. Media Contact: Investor Contact: Bryce Hallowell Steve Wold Phone: 952-351-3087 Phone: 952-351-3056 E-mail: E-mail:

Source: ATK
Date: Jun 17, 2005

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