ATK Extendible Support Structure Operates Successfully on the RADARSAT-2 Mission

ATK Built Hardware Enables Full Functionality of Synthetic Aperture Radar Panels

Alliant Techsystems (NYSE: ATK) announced today that its extendible support structure (ESS) operated as designed on the RADARSAT-2 mission that was launched Saturday, Dec. 14th on a Soyuz vehicle from Russia’s Baikonur Cosmodrome in Kazakhstan. Once on orbit ATK’s ESS built in its Goleta, Cal. facility deployed flawlessly. The ESS’s precision deployment and in-orbit stiffness and stability enable functionality of the mission’s synthetic aperture radar (SAR) panels.

“The seamless deployment of the ESS is another example of ATK’s capability to provide and execute mission critical subsystems and components for important missions,” stated Mike Cerneck, Vice President and General Manager of ATK Space.

RADARSAT-2 is collaborative mission between the Canadian Space Agency and MacDonald, Dettwiler and Associates Ltd. (MDA). MDA is the prime contractor for RADARSAT-2, and is responsible for all aspects of the program, from initial design and development, through launch, operations planning and distribution of data. The satellite will provide enhanced information for applications such as environmental monitoring, ice mapping, resource mapping, disaster management, and marine surveillance.

ATK is an advanced weapon and space systems company with annual revenues in excess of $4.1 billion that employs more than 17,000 people in 21 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: the challenges of developing advanced space exploration technologies, 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, please refer to ATK’s most recent Annual Report on Form 10-K and any subsequent quarterly reports on Form 10-Q and current reports on Form 8-K filed with the U.S. Securities and Exchange Commission.