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ATK supports successful flight test of a Ground-based Midcourse Defense (GMD) interceptor boost vehicle

Orion Motors Power Orbital Sciences Interceptor Boost Vehicle

Feb 4, 2004

Minneapolis, Feb. 4, 2004 – ATK (Alliant Techsystems, NYSE: ATK) supplied three solid rocket motors used in the successful flight test of an Orbital Sciences Corporation (NYSE: ORB) Ground-based Midcourse Defense (GMD) interceptor boost vehicle. The Integrated Flight Test-13b (IFT-13b) was conducted on January 26, and originated from the Ronald Reagan Ballistic Missile Defense Test Site in the Kwajalein Atoll in the Pacific Ocean. The launch was the third consecutive success of the ATK-powered boost vehicle.

The IFT-13b launch was part of an ongoing planned series of flight tests for the GMD program. Preliminary data indicate that the booster system met all test objectives.

ATK Thiokol Propulsion, Promontory, Utah, is the solid propulsion supplier on the Orbital team developing the boost vehicle for The Boeing Company, the prime contractor for the GMD program.

The three-stage boost vehicle uses modified Orion motors manufactured by ATK Thiokol Propulsion at its rocket motor facility in Magna, Utah. Orion motors are also flown on Orbital’s Taurus®, Pegasus®, Minotaur and Hyper-X launch vehicles.

The graphite epoxy cases used for Orion motors are manufactured by ATK Composites, Clearfield, Utah.

ATK is a $2.2 billion aerospace and defense company with strong positions in propulsion, composite structures, munitions, precision capabilities, and civil and sporting ammunition. The company, which is headquartered in Edina, Minn., employs approximately 12,600 people and has three business groups: Precision Systems, Aerospace, and Ammunition and Related Products. ATK news and information can be found on the Internet at www.atk.com.

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