NASA Completes Altitude Testing of Aerojet Advanced Liquid Oxygen/Liquid Methane Rocket Engine

SACRAMENTO, Calif., May 4, 2010 – Aerojet, a GenCorp (NYSE: GY) company, announced today that NASA has successfully completed altitude testing of Aerojet’s advanced 5500-lbf Liquid Oxygen (LOX)/Liquid Methane (LCH4) Rocket Engine at NASA’s White Sands Test Facility (WSTF).

Aerojet and Florida Turbine Technologies Join In Strategic Partnership to Develop NASAs New Rocket Engines

SACRAMENTO, Calif. and Jupiter, Fla. April 29, 2010 — Aerojet, a GenCorp (NYSE:GY) company, and Florida Turbine Technologies (FTT) announced today that the companies have entered into a strategic partnership to compete for research, development and production on NASA’s new hydrocarbon engine and advanced upper stage engine.

Aerojet and CDMs Innovative Perchlorate Remediation Project Recognized with Superior Achievement Award for Environmental Engineering Excellence

SACRAMENTO, Calif., April 28, 2010 – Aerojet, a GenCorp (NYSE: GY) company, and CDM announced today that their joint project, which demonstrated effective, in-place removal of perchlorate from contaminated soil, has won the American Academy of Environmental Engineers’ (AAEE) 2010 Superior Achievement Award for Environmental Engineering Excellence.

Aerojet and UEC Take Next Steps in Cooperation on Rocket Engines for Space Launch Market

Russian NK-33 engine and its U.S. Commercial Derivative AJ26 Offer Customers High Performance and Durability at a Competitive Price

Aerojet Completes Second Series of Vibration and Hot Fire Risk Reduction Engine Tests for NASAs Orion Crew Exploration Vehicle

SACRAMENTO, Calif., April 19, 2010 – Aerojet, a GenCorp (NYSE: GY) company, successfully completed a second series of vibration and altitude hot-fire tests on its 160-pound thrust mono-propellant rocket engine planned for use on NASA’s Orion spacecraft.