DULLES, Va., Jun 24, 2002 /PRNewswire-FirstCall via COMTEX/ --

Mission Marks Company's Sixth Successful Ballistic Target Vehicle Launch in 2002

Orbital Sciences Corporation (NYSE: ORB) announced today that it successfully launched the suborbital rocket that served as the target vehicle for a test of the U.S. Missile Defense Agency's (MDA) Sea-Based Aegis Ballistic Missile Defense system. The launch of Orbital's Target Test Vehicle (TTV) originated from the island of Kauai, Hawaii on Thursday, June 13. Orbital's role in the test, which was led by the company's Launch Systems Group in Chandler, AZ, was to supply the TTV and conduct the launch operations as contracted by the U.S. Air Force Space and Missile Systems Center (AF/SMC).

"The Air Force Space and Missile Systems Center is a key customer for our ballistic target and space launch vehicle products," said Mr. Ronald J. Grabe, Orbital's Executive Vice President and General Manager of its Launch Systems Group. "We are very proud to have carried out another successful target vehicle mission for the U.S. missile defense effort."

Orbital is one of the country's leading suppliers of ballistic target vehicles and interceptor boosters for missile defense applications. The company's target vehicles are used to support numerous Department of Defense programs, including both the Ground-Based Midcourse and Sea-Based Aegis Ballistic Missile Defense systems, as well as other AF/SMC programs. Orbital's target vehicles are also used to support the U.S. Army's THAAD, PAC- 3, CMP and SRALT programs. In addition to target vehicles, Orbital is now executing a contract it received earlier this year from The Boeing Company to design, develop, manufacture and test new interceptor boost vehicles for the Ground-Based Midcourse Defense segment of the U.S. missile defense effort.

Orbital is one of the world's leading developers and manufacturers of affordable space systems for commercial, civil government and military customers. The company's primary products include low-orbit, geostationary and planetary spacecraft for communications, scientific and remote sensing missions; ground- and air-launched rockets that deliver satellites into orbit; and missile defense boosters that are used as target and interceptor vehicles. Orbital also offers space-related technical services to government agencies and develops and builds satellite-based transportation management systems for public transit agencies and private vehicle fleet operators.

    More information about Orbital can be found at http://www.orbital.com .
CONTACT: Barron Beneski, Public and Investor Relations, of Orbital Sciences Corporation, +1-703-406-5528, or Beneski.barron@orbital.com

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SOURCE Orbital Sciences Corporation

CONTACT:          Barron Beneski, Public and Investor Relations, of Orbital
                  Sciences Corporation, +1-703-406-5528, or Beneski.barron@orbital.com

URL:              http://www.orbital.com 
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