Aerojet SM-3 Block IB TDACS Completes Qualification Testing

Aerojet SM-3 Block IB TDACS Completes Qualification Testing

SACRAMENTO, Calif., March 13, 2013 (GLOBE NEWSWIRE) -- Aerojet, a GenCorp
(NYSE:GY) company, announced that it completed Throttling Divert and Attitude
Control System (TDACS) qualification testing with the successful altitude hot
fire test for the Standard Missile-3 (SM-3) Block IB program. The SM-3 program
is managed by the Missile Defense Agency (MDA) and by prime contractor
Raytheon.

The final TDACS qualification unit was altitude tested at Aerojet's
Sacramento, Calif., headquarters. A total of five TDACS were subjected to
rigorous qualification requirements. The units were exposed to environmental
extremes and various operational duty cycles. The success of these tests
validates that the SM-3 Block IB TDACS design with Aerojet's unique throttling
solid propulsion technology can operate in all expected environments.

"This is the last qualification test in a series of five qualification tests.
It is the final ground test verification needed to support SM-3 Block IB
production decisions this year," said Michael Bright, vice president of the
Missile Defense and Strategic Systems Business Unit.

"These successful qualification tests reflect the significant engineering
discipline and technical excellence used to develop Aerojet's TDACS," said
Marvin Young, vice president of Engineering.

The SM-3 Block IB TDACS is produced at Aerojet's Sacramento, Calif., facility.
The SM-3 is powered by Aerojet's MK 72 first stage booster and MK 104 second
stage dual-thrust rocket motor which are produced at Aerojet's Camden, Ark.,
facility.

SM-3 Block IB, developed as part of MDA's Aegis Ballistic Missile Defense
System Phased Adaptive Approach, uses hit-to-kill technology to destroy
targets, and is designed to engage threat ballistic missiles outside of the
Earth's atmosphere during the mid-course phase of an incoming missile.

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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