Aerojets Successful Main Engine Injector Tests Provide Milestone for NASAs Orion Crew Exploration Vehicle, Testing confirms combustion stability and provides initial performance data

SACRAMENTO, Calif., Sept. 30, 2010 – Aerojet, a GenCorp (NYSE: GY) company, under contract to Lockheed Martin, successfully completed development injector testing for the 7500-pound thrust Orion main engine (OME) for NASA’s Orion crew exploration vehicle.

Aerojet Produces 1000th Rocket Motor for U.S., Canadian and Royal Australian Navies

SACRAMENTO, Calif., Sept. 30, 2010 – Aerojet, a GenCorp (NYSE: GY) company, announced today that the company has produced 1000 solid rocket motors for the MK234 Nulka active expendable decoy. A ceremony attended by congressional, diplomatic, Navy and industry officials was held at Aerojet’s Orange County, Va. facility today to commemorate the milestone.

Aerojet Delivers Upper Stage Engine Technology (USET) Liquid Hydrogen Turbopump to AFRL

SACRAMENTO, Calif., Sept. 28, 2010 – Aerojet, a GenCorp (NYSE: GY) company, announced today that under contract to the Air Force Research Laboratory (AFRL) Propulsion Research Directorate, the company has developed critical technologies for rocket propulsion applications through the Upper Stage Engine Technologies (USET) program.

Aerojet Successfully Conducts Third Jettison Motor Nozzle Risk Reduction Test for NASA’s Orion Crew Exploration Vehicle

SACRAMENTO, Calif., Sept. 23, 2010 – Aerojet, a GenCorp (NYSE: GY) company, announced today that it successfully conducted a static firing of the third nozzle risk reduction motor in support of the Orion jettison motor, a critical component of the launch abort system (LAS) for NASA’s Orion crew exploration vehicle.

Aerojet Joins in New Outreach Effort by Becoming a Founding Sponsor of Explore Mars

SACRAMENTO, Calif., Sept. 15, 2010 – Aerojet, a GenCorp (NYSE: GY) company, announced today that it has become a founding sponsor of Explore Mars, a newly formed 501(c)(3) nonprofit corporation created to promote science and technology innovation through outreach and education efforts related to human exploration of the planet Mars.