Three in a Row! Aerojet Supports Successful Atlas V Launch

SACRAMENTO, Calif., March 11, 2005 -- Aerojet, a GenCorp Inc. (NYSE: GY) company, supported the third successful launch of the Lockheed Martin Atlas® V vehicle, featuring three single structure 67-foot Aerojet solid rocket boosters. The boosters provided 750,000 lbs. of additional thrust for the Atlas launch vehicle and its Inmarsat I-4 satellite payload. Aerojet's HiPAT bipropellant engine also supported the spacecraft.

The first successful flight of Aerojet’s solid rocket boosters was July 19, 2003. The second successful flight took place Dec. 17, 2004.

Aerojet is a world-recognized aerospace and defense leader principally serving the missile and space propulsion, defense and armaments markets. GenCorp is a leading technology-based manufacturer of aerospace and defense products and systems with a real estate 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.