Aerojets AJ26 Flight Engine Successfully Hot-Fire Tested for Orbitals Taurus II Space Launch Vehicle

SACRAMENTO, Calif., Nov. 10, 2010 – Aerojet, a GenCorp (NYSE: GY) company, announced that its AJ26 engine was hot-fire tested today at NASA’s Stennis Space Center in Mississippi. In support of the Taurus® II launch vehicle program, Orbital Sciences Corporation (Orbital), Aerojet and NASA conducted this first of three hot-fire engine tests to be performed throughout the next several weeks.

Aerojet Engine Powers Delta II Second Stage for the COSMO-SkyMed Constellation

SACRAMENTO, Calif., Nov. 8, 2010 – Aerojet, a GenCorp (NYSE: GY) company, announced that its engine helped propel Friday night’s launch of the Delta II launch vehicle from Vandenberg Air Force Base (VAFB) in Calif. This is the fourth launch, completing the COSMO-SkyMed constellation.

Aerojet Completes Acceptance Testing on Second R-4D Development Engine Supporting NASAs Orion Service Module

SACRAMENTO, Calif., Nov. 1, 2010 – Aerojet, a GenCorp (NYSE: GY) company, in conjunction with Lockheed Martin and NASA, successfully completed acceptance testing on the second R-4D development engine. The R-4D is the Aerojet engine that will be used on NASA’s Orion crew exploration vehicle for the service module auxiliary propulsion.

Aerojet Powers Japans Third Successful Standard Missile-3 Intercept

SACRAMENTO, Calif., Oct. 29, 2010 – Aerojet, a GenCorp (NYSE: GY) company, announced today that the Japan Maritime Self-Defense Force achieved its third ballistic missile intercept using a Raytheon Company Standard Missile-3 (SM-3) Block IA missile.

Aerojet Technology Successfully Flight Tested to Replace Dual Purpose Conventional Munition Submunitions

SACRAMENTO, Calif., Oct. 19, 2010 – Aerojet, a GenCorp (NYSE: GY) company, recently demonstrated its alternative warhead technologies in a tactical missile flight environment. The successful demonstrations were conducted to test Aerojet’s solution to eliminate unexploded ordnance (UXO) on the U.S. Army’s Guided Multiple Launch Rocket System (GMLRS).