Aerojet’s liquid second-stage engine helped power the United Launch Alliance Delta II launch vehicle and its satellite payload in a launch today from Vandenberg Air Force Base, Calif. The Delta II vehicle, known as the workhorse of the launch industry in its payload class, carried a classified payload for the U.S. National Reconnaissance Office.

Aerojet’s Delta II second stage engines are among the world’s most reliable and were called upon once again to complete a mission important to national security. This launch marks the 254th successful Delta launch to date using Aerojet’s second-stage engines. Aerojet, a GenCorp Inc. (NYSE: GY – News) company, has provided second stage engines for the Delta II since 1982.

Aerojet’s second stage liquid rocket engine has a record of unblemished success and owes its longevity to a robust design and the use of proven components that have evolved over the engine’s lifetime to enhance performance and meet customer requirements. Aerojet’s second-stage engine support of the Delta II will continue through at least 2010.

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 http://www.Aerojet.com and http://www.GenCorp.com .