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.

Through its sponsorship of the Mars Education Challenge and other Explore Mars initiatives, Aerojet hopes to expand public awareness and get more students interested in pursuing careers in engineering and science. Public outreach and STEM activities are both very important to Aerojet’s role as a leading aerospace company.

Joe Cassady, Aerojet’s business development capture lead for Exploration Programs, was also named by Explore Mars to serve as a board member. “Mars has always held a special fascination for me and I welcome the opportunity to represent Aerojet in Explore Mars and to help define the outreach efforts to get more educators and private citizens involved in its exploration,” said Cassady.

"We are pleased to have Aerojet as a founding sponsor," said Explore Mars Executive Director, Chris Carberry. "Few other companies have as much passion and experience in advancing the exploration of Mars."

Explore Mars is a project-oriented nonprofit group created to promote science and technology innovation and education with a use for Mars exploration. Through a series of technology innovation awards, scientific symposiums and workshops, Mars analog work, technology demonstrations and other programs, Explore Mars will provide a platform for scientists and "citizen scientists" to engage in meaningful space exploration research and development in the private sector. More information on Explore Mars can be found on its Web site at www.exploremars.org.

Aerojet is a world-recognized aerospace and defense leader principally serving the missile and space propulsion, defense and armaments 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’ Web sites at http://www.Aerojet.com and http://www.GenCorp.com.