For Immediate Release
For More Information Contact:
Barron Beneski (703) 406-5528
Public and Investor Relations
beneski.barron@orbital.com

ORBITAL NAMES KATE KRONMILLER SENIOR VICE PRESIDENT
OF GOVERNMENT RELATIONS

(Dulles, VA 11 October 2011) - Orbital Sciences Corporation (NYSE: ORB), one of the world's leading space technology companies, today announced that it has named Kate Kronmiller Senior Vice President of Government Relations. Ms. Kronmiller comes to Orbital from United Space Alliance (USA), where she was Vice President of Washington Operations for the past 14 years.

"We are delighted to welcome Kate to Orbital's senior management team at this exciting time in the advancement of commercial space," said Mr. Michael Hamel, Orbital's Senior Vice President of Corporate Strategy and Development. "Kate is a well-known and respected industry representative to virtually all Federal, state and local government organization involved in supporting the space industry and the significant technological, economic and employment benefits it generates for the benefit of the nation. She brings a deep body of knowledge, boundless energy and exceptional leadership skills to our team."

In her position with Orbital, Ms. Kronmiller will be responsible for developing and implementing the company's engagement strategy with Congress and the Executive Branch of the Federal government, as well as managing the company's interaction with state and local officials. She will work with Orbital's internal Operating Groups to identify opportunities for the company to apply its innovative and affordable space technology in ways that benefit government customers while furthering Orbital's strategic goals.

Since 1997, Ms. Kronmiller held a comparable position at USA, a joint venture formed by Boeing and Lockheed Martin primarily responsible for carrying out all aspects of Space Shuttle and Space Station operations. Prior to USA, she worked at Rockwell International and Space Services Inc. where she helped shape the policies and procedures for the commercialization of space.

Ms. Kronmiller is involved in numerous industry-related groups, including the National Space Club and the American Institute of Aeronautics and Astronautics, and is one of the original co-founders of Women in Aerospace. She was also a member of the first class of Sea Grant Fellows established by the National Oceanic and Atmospheric Administration.

Ms. Kronmiller holds a M.S. degree in Science, Technology and Public Policy from George Washington University and attended the University of Pennsylvania and American University for her B.S. degree in Biology and Engineering.

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Orbital Names Kate Kronmiller Senior Vice President of Government Relations - Page 2


About Orbital

Orbital develops and manufactures small- and medium-class rockets and space systems for commercial, military and civil government customers. The company's primary products are satellites and launch vehicles, including low-Earth orbit, geosynchronous-Earth orbit and planetary exploration spacecraft for communications, remote sensing, scientific and defense missions; human-rated space systems for Earth-orbit, lunar and other missions; ground- and air-launched rockets that deliver satellites into orbit; and missile defense systems that are used as interceptor and target vehicles. Orbital also provides satellite subsystems and space-related technical services to U.S. Government agencies and laboratories. More information about Orbital can be found at http://www.orbital.com

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