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Aerojet's Dual AJ26 Engines Launch Historic Antares Test Flight

Aerojet's Dual AJ26 Engines Launch Historic Antares Test Flight

SACRAMENTO, Calif., April 21, 2013 (GLOBE NEWSWIRE) -- Aerojet, a GenCorp
(NYSE:GY) company, announced today that its dual AJ26 main engine system
successfully powered the first stage of Orbital Sciences Corporation's
(NYSE:ORB) Antares rocket as the vehicle was launched on its maiden flight
from NASA Wallops Flight Facility.

The two Aerojet AJ26 engines, which form the Antares rocket's first-stage main
engine system, burned for 233 seconds and provided 816,000 lbs of vacuum
thrust as it powered Antares from the launch pad to a velocity of 9,800 miles
per hour and a target orbit of 250 km x 300 km.

The launch was a test flight of the Antares launch system conducted under
NASA's Commercial Orbital Transportation Services (COTS) development agreement
with Orbital. COTS helps American industry develop privately-operated space
transportation systems.

"Today's test is the culmination of some of the most challenging and rewarding
work we've had the privilege to support," said Aerojet Vice President, Space &
Launch Systems, Julie Van Kleeck.

The AJ26 is a commercial derivative of the NK-33 engine that was first
developed for the Russian N-1 rocket by the Joint Stock Company Kuznetsov. The
oxidizer-rich, staged-combustion, oxygen kerosene engine achieves very high
performance in a lightweight, compact package.

"The two AJ26 engines that launched today's flight were originally slated to
power the N-1 rocket on a lunar mission in the early 1970s," said Aerojet
Executive Director, Pete Cova. "Today's mission marks the first time these
engines are reaching space, which is a significant milestone for both the U.S.
and Russian companies involved."

To modernize the NK-33 for commercial applications, Aerojet enhancements
include a gimbal block for thrust vectoring capability, new wiring harnesses
and electrical circuitry, electromechanical valve actuators and
instrumentation.

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.

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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