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09/20/06
ATK Receives Initial $10 Million Contract to Prepare to Supply USEC With Composite Tubes for Uranium Enrichment Operations

ATK's High Volume Production Run Could Result in Revenues of More Than $250 Million

Nuclear Power Generation is Latest Market for ATK's Advanced Composite Manufacturing Expertise

USEC Contract Will Be Largest Commercial Composite Production Run in ATK's History

Minneapolis, September 20, 2006 – Alliant Techsystems (NYSE: ATK) is performing work under an initial $10 million contract to prepare for high-volume manufacturing of composite rotor tubes for USEC Inc.'s (NYSE: USU) American Centrifuge program. ATK expects to provide USEC with approximately 12,000 rotor tubes throughout the four-year production run, making this program the largest commercial composite production program in ATK's history. When completed, ATK estimates that total revenue from the program may exceed $250 million.

Each rotor tube is approximately 24 inches in diameter and about 43 feet long. The tubes will be used by USEC in a gas centrifuge process that will yield enriched uranium fuel for commercial nuclear power plants. The centrifuge process is significantly more cost effective than the traditional gaseous diffusion process, using only 5 percent of the electricity used in the current process.

“Power generation is the most recent example of how ATK's industry-leading expertise in the design, development and production of advanced composite structures is dramatically altering the landscape of traditional manufacturing materials and processes, said Jack Cronin, President, ATK Mission Systems Group. “The strength, reduced-weight and low-cost of composite materials have a long and valued heritage in space exploration and launch vehicles, but today are equally at home in military and commercial aircraft, as well as power-generation, shipbuilding and many other industries.”

“We're proud to have ATK manufacture rotor tubes for USEC's American Centrifuge Plant,” said John K. Welch, USEC president and chief executive officer. “ATK's manufacturing expertise and American know-how will support the only domestic uranium enrichment facility using U.S. centrifuge technology, which makes the American Centrifuge Plant strategically important to our nation's energy security, energy independence and industrial manufacturing base.”

Work on the demonstration and qualification phase of the program is being performed at ATK's Space Systems & Sensors facility in Clearfield, Utah. Once qualified, ATK intends to transition production to its manufacturing center of excellence in Rocket Center, West Virginia. The rotor tubes will be shipped to USEC's production facility in Piketon, Ohio, beginning in 2008.

USEC Inc., a global energy company, is a leading supplier of enriched uranium fuel for commercial nuclear power plants. 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 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 composite structures; 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.

Media Contact:
Bryce Hallowell
Phone: 952-351-3087
E-mail: bryce.hallowell@atk.com

Investor Contact:
Steve Wold
Phone: 952-351-3056
E-mail: steve.wold@atk.com