Aerojet Wins Key Missile Defense Propulsion Work
Company Chosen to Provide Attitude Control Systems for Ballistic Missile Interceptor

SACRAMENTO, Calif., Dec. 1, 2004 -- Aerojet, a GenCorp Inc. (NYSE: GY) company, was selected Monday by Orbital Sciences Corporation of Chandler, Ariz. to build an Attitude Control System (ACS) for the second and third stages of the Kinetic Energy Interceptor (KEI) booster. The ACS will stabilize the interceptor missile booster during ascent and ensure proper attitude and trajectory control.

KEI, an element of the Ballistic Missile Defense System, provides land and sea-based capabilities for destroying enemy ballistic missiles during the boost and early ascent phase. Aerojet is also developing a liquid Divert and Attitude Control System for the KEI Kill Vehicle, under contract with KEI Prime Contractor Northrop Grumman and The Raytheon Company.

“Aerojet’s win continues to solidify the company’s position as a key missile defense booster control supplier,” said Aerojet President Michael Martin. “Building on existing ACS work, as well as successes in controllable thrust propulsion programs, we have demonstrated to the missile defense community that we are the leader in providing flight-proven, cost-effective assemblies that feature mature technology.”

Aerojet is under contract to provide Orbital, the propulsion supplier for KEI, with a second stage ACS for a planned booster test flight in 2007.

Aerojet is a world-recognized aerospace and defense leader principally serving the missile and space propulsion, and defense 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 development, sale and leasing of the Company’s 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.

Forward-Looking Statements

This press release contains forward-looking statements based on current management expectations. Numerous factors, including those related to market conditions and those detailed from time to time in GenCorp's filings with the Securities and Exchange Commission, may cause results to differ materially from those anticipated in the forward-looking statements. Many of the factors that will determine GenCorp's future results are beyond the ability of GenCorp to control or predict. These statements are subject to risks and uncertainties and, therefore, actual results may differ materially. Readers should not place undue reliance on forward-looking statements, which reflect management's views only as of the date hereof. GenCorp undertakes no obligation to revise or update any forward-looking statements, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise.

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