Aerojet Rocket Motors Launch Eighth Successful Missile Defense Intercept

SACRAMENTO, Calif., April 25 // -- Aerojet, a GenCorp Inc. (NYSE:GY) company, completed a successful demonstration of its MK 104 second-stage rocket motor in a Missile Defense Agency/Aegis Ballistic Missile Defense (BMD) test over the Pacific Ocean. Aerojet is building MK 104 solid rocket motors for the Standard Missile-3 (SM-3) under a contract with Raytheon Company.

The Aegis BMD system, of which the SM-3 is a part, is designed to intercept and destroy ballistic missiles outside the earth's atmosphere. This was the eighth successful ballistic missile intercept test of the Aegis Ballistic Missile Defense Program. "The continued success of Aegis BMD, including the SM-3, demonstrates the Raytheon team's focus on mission assurance and Aerojet's ability to develop reliable and effective propulsion systems," says Aerojet Vice President of Defense Systems, Dick Bregard.

In addition to the MK 104, Aerojet is also in the process of qualifying the MK 72 first-stage boost motor for future flight tests for the SM-3 missile.

Aerojet is a world-recognized aerospace and defense leader principally serving the missile and space propulsion and armaments markets. GenCorp is a leading technology-based manufacturer of aerospace and defense products and systems with a real estate business segment that includes activities related to the entitlement, sale, and leasing of the company's excess real estate assets. Additional information about Aerojet and GenCorp can be obtained by visiting the companies' Web sites at and

Source: Aerojet

CONTACT: Kristin Conner of Aerojet, 916-355-2143, or; or Linda Cutler of GenCorp, 916-351-8650, or

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