Aerojet's AJ26 Engines Ignite Successful Antares(TM) Stage Test Hot Fire

Aerojet's AJ26 Engines Ignite Successful Antares(TM) Stage Test Hot Fire

SACRAMENTO, Calif., Feb. 22, 2013 (GLOBE NEWSWIRE) -- Aerojet, a GenCorp
(NYSE:GY) company, announced that its dual AJ26 main engine system
successfully powered today's Antares™ Stage 1 Hot Fire test conducted by
Orbital Sciences Corporation (NYSE:ORB) at the Mid-Atlantic Regional Spaceport
located at NASA's Wallops Flight Facility on the eastern shore of Virginia.

The 29-second test enabled engineers to validate flight configuration checkout
of the Antares main engine system and first stage booster. During this "strap
down" test, the AJ26 engines produced approximately 680,000 lbs of sea-level
thrust.

"Today's successful stage test positions us one step closer to supporting
Orbital's historic flight test," said Aerojet Vice President of Space & Launch
Systems, Julie Van Kleeck. "We're proud to deliver for the Antares team and
we're looking forward to continuing the countdown toward the inaugural
mission."

The AJ26 is a commercial derivative of the NK-33 engine that was first
developed for the Russian N-1 rocket. The NK-33, oxidizer-rich,
staged-combustion LO2/Kerosene engine is among the highest thrust-to-weight
ratio of any Earth-launched rocket engine.

"Aerojet purchased the NK-33 engines from JSC Kuznetsov in the mid-1990s and
has been developing design modifications to ensure that the AJ26 is suitable
for U.S. commercial launch vehicles," said Aerojet Executive Director of Space
& Launch Systems, Pete Cova. "As teammates, JSC Kuznetsov brings tremendous
technical support to our efforts and we are looking forward to supporting
Orbital in its Cargo Resupply Contract with NASA."

Aerojet is a world-recognized aerospace and defense leader providing
propulsion and energetics to the space, missile defense, strategic, tactical
missile and armaments areas in support of domestic and international 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' websites at http://www.Aerojet.com and
http://www.GenCorp.com.

The Aerojet logo is available at
http://www.globenewswire.com/newsroom/prs/?pkgid=12048

CONTACT: Glenn Mahone, Aerojet, 202.302.9941
         Glenn.Mahone@Aerojet.com
         Kristin Conner, Aerojet, 916.355.2143
         Kristin.Conner@Aerojet.com

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