Photo Release -- Aerojet's AJ26 Engine Completes Successful Hot Fire in Support of Antares(TM) Rocket

Photo Release -- Aerojet's AJ26 Engine Completes Successful Hot Fire in
Support of Antares(TM) Rocket

SACRAMENTO, Calif., Jan. 18, 2013 (GLOBE NEWSWIRE) -- Aerojet, a GenCorp
(NYSE:GY) company, announced today that its AJ26 engine successfully completed
a hot fire test this evening at NASA's Stennis Space Center.

AJ26 Engine
 AJ26 engine completes successful hot
 fire test at NASA's Stennis Space
 Center

A photo accompanying this release is available at
http://www.globenewswire.com/newsroom/prs/?pkgid=16718

Orbital Sciences Corporation (NYSE:ORB), Aerojet and NASA monitored the
full-duration test in support of the Antares™ rocket program. This is the
eleventh AJ26 engine to be tested at Stennis.

"This test kicks off a crucial year for the AJ26 engine," said Aerojet
Executive Director of Space & Launch Programs, Pete Cova. "We have multiple
engine acceptance tests at Stennis in the plan as well as support of the
upcoming Antares Stage 1 Hot Fire Test and the first demonstration test
flight.Our team has worked hard to get to this point and we're looking
forward to seeing AJ26 engines fly."

Following review of the test data, the AJ26 will be configured for flight and
shipped to NASA's Wallops Flight Facility for integration with Orbital's
Antares rocket and will provide boost for the first stage of the Antares
rocket.

Aerojet's AJ26 engine is an oxidizer-rich, staged-combustion LO2/Kerosene
engine that achieves very high performance in a lightweight compact package.
The AJ26 is a modified NK-33 engine originally designed and produced in Russia
for the Russian N1 lunar launch vehicle.Aerojet purchased approximately 40
NK-33 engines in the mid-1990s and, under contract with Orbital, the company
is modifying the engines specifically for the Antares rocket. Aerojet has been
developing design modifications to the NK-33 since the mid-1990s to ensure
that the AJ26 is suitable for commercial launchers.

In addition to the AJ26 certification testing, each AJ26 engine to be used on
an Antares rocket will come through the Stennis facility for pre-launch
acceptance testing prior to being integrated with the rocket.

The Antares rocket vehicle is being developed to boost payloads into a variety
of low-Earth and geosynchronous transfer orbits and to Earth escape
trajectories. It incorporates proven technologies from a worldwide network of
suppliers.The Antares rocket will also be available to civil government and
U.S. military customers for dedicated launch services for medium-class
scientific and national security satellites.

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 www.Aerojet.com and at
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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