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Aerojet Demonstrates Innovative Thruster for Missile Defense Agency's NCADE Program

SACRAMENTO, Calif., April 24 /PRNewswire-FirstCall/ -- Aerojet, a GenCorp (NYSE: GY) company, recently completed a successful full-duration development test firing of its innovative Axial HAN Thruster for the Missile Defense Agency and Raytheon Company's (NYSE: RTN) Net-Centric Airborne Defense Element (NCADE) program.

NCADE is an air-launched weapon system designed to engage short- and medium-range ballistic missiles in the boost and ascent phase of flight. The system provides an interim or near-term solution to boost or ascent phase threats, and is based on the Advanced Medium Range Air-to-Air Missile (AMRAAM) that adds proven seeker technology from Raytheon.

Aerojet's spiral development, second-stage propulsion system uses an advanced Hydroxylammonium nitrate (HAN) monopropellant thruster providing higher performance and high-density packaging to ultimately power lighter, higher-velocity missiles. HAN is less toxic and easier to handle than other propellants and could eventually enable safe shipboard operation. The technology signifies an important advancement in missile defense propulsion technology and this success builds on thruster and propellant technology that has been developed collaboratively between Aerojet and USAF Air Force Research Laboratory.

Aerojet's recent fast-paced design, build and test program has provided valuable risk reduction for the Axial Thruster and is widely recognized as a key advancement in fielding non-toxic propulsion systems. The challenge to introducing new rocket propellant is to produce stable and controllable combustion. Aerojet achieved very stable combustion of HAN which will enable higher performance and better packaging. "Aerojet overcame significant technical challenges in this thruster development program," said Dick Bregard, Aerojet's vice president of Defense Programs. "This testing opens a new range of possibilities for rocket engines using non-toxic, high performance propellants. The monopropellant technology offers significant simplification and higher performance compared to existing systems," he said.

Aerojet's successful test program provides the hot fire data needed to develop new flight-weight designs and fabricate next generation Axial and Divert thrusters for NCADE, and a variety of other Missile Defense Agency and potential space flight applications.

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 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.

SOURCE Aerojet - 04/24/2008

CONTACT:
Glenn Mahone, +1-202-302-9941, Glenn.Mahone@Aerojet.com, or
Kristin Conner, +1-916-355-2143, Kristin.Conner@Aerojet.com, both of Aerojet; or
Linda Cutler of GenCorp, +1-916-351-8650, Linda.Cutler@GenCorp.com
Web site: http://www.aerojet.com
http://www.GenCorp.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.