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GenCorp's Aerojet Subsidiary Conducts Final Test Fire of Atlas V Solid Rocket Motor

SACRAMENTO, Calif., Dec. 11 /PRNewswire-FirstCall/ -- GenCorp Inc. (NYSE: GY), announced that its subsidiary, Aerojet-General Corporation (Aerojet) today conducted the last in a series of three test firings of its 67-foot solid rocket motor. The motor, planned for use on Lockheed Martin's Atlas(R) V launch vehicle, was fixed horizontally to a massive test stand and fired for more than 90 seconds. Preliminary review of data collected during the test fire indicates the motor achieved all performance objectives.

"Today's test was the final critical milestone for use of the Aerojet solid rocket motor on Lockheed Martin's Atlas V launch vehicle," said Mark Kaufman, Aerojet Atlas V program director. "The test demonstrated Aerojet's superior capabilities in designing, manufacturing, and producing large solid rocket motors." Up to five solid rocket motors can be used on an Atlas V 400 or 500 series vehicle, depending on the mission requirements.

Today's test marks the third -- and final -- qualification motor firing of the solid rocket motor for application on Lockheed Martin's Atlas V. The qualification phase completion is expected in February 2003 with production and delivery for a first motor flight set to begin in 2003.

Aerojet, headquartered in Sacramento, California, is a world-recognized aerospace and defense leader principally serving the missile and space propulsion, and defense and armaments markets. GenCorp Inc. is a multi-national, technology-based manufacturer with leading positions in the automotive, aerospace, defense and pharmaceutical fine chemicals industries. For more information, please visit http://www.aerojet.com and http://www.gencorp.com .

This release contains forward-looking statements as defined under the federal securities laws, including statements about the beneficial use of the Aerojet solid rocket motor. Such forward-looking statements involve risks and uncertainties, which could cause actual results to differ from the statements.

Other risk factors are described in more detail in GenCorp's Annual Report on Form 10-K for the year ended November 30, 2001 and its subsequent periodic and other filings with the Securities and Exchange Commission, including its most recent 10-Q filed for the period ending August 31, 2002. Additional risks may be described from time to time in future filings with the U.S. Securities and Exchange Commission. All such risk factors are difficult to predict, contain material uncertainties that may affect actual results, and may be beyond GenCorp's control.

SOURCE GenCorp Inc.

CONTACT: investors, Yasmin Seyal, senior vice president and chief financial officer, +1-916-351-8585, or press, Linda Beech Cutler, vice president, Corporate Communications, +1-916-351-8650, both of GenCorp Inc.

/Web site: http://www.aerojet.com /

"Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Statements in this press release regarding GenCorp Inc.'s business which are not historical facts are "forward-looking statements" that involve risks and uncertainties. For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see "Risk Factors" in the Company's Annual Report or Form 10-K for the most recently ended fiscal year.

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