DULLES, Va., Feb 1, 2002 /PRNewswire-FirstCall via COMTEX/ --

- Company's Rocket Supports First Exo-Atmospheric Test of Shipboard Interceptor -

Orbital Sciences Corporation (NYSE: ORB) announced today that it successfully launched the suborbital rocket that served as the target vehicle for last Friday's test of the U.S. Missile Defense Agency's (MDA) Sea-based Midcourse missile defense program. The launch of Orbital's Target Test Vehicle (TTV) originated from the island of Kauai, Hawaii on January 25. Orbital's role in the test, which was carried out by the company's Launch Systems Group in Chandler, AZ, was to supply the TTV rocket and conduct the launch operations under contract to the U.S. Air Force Space and Missile Center.

"We are very proud to have carried out another successful target vehicle mission for the U.S. missile defense effort," said Mr. Ronald J. Grabe, Orbital's Executive Vice President and General Manager of its Launch Systems Group. "This successful target mission adds to Orbital's extensive track record of launching missile defense-related vehicles for U.S. Department of Defense customers."

Orbital is one of the country's most experienced builders and operators of suborbital boosters and anti-ship cruise missile targets that are used to test defensive weapons systems. In addition to TTV's for the Sea-based Midcourse Defense System, Orbital supplies the primary target vehicles for MDA's Ground- based Midcourse Defense System (GMDS). The company also supports other U.S. missile defense programs, with target vehicles for the U.S. Army's PAC-3 and THAAD interceptors and suborbital boosters for the Critical Measurements Program as well as for the U.S. Navy's supersonic ship self-defense systems.

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 are spacecraft and launch vehicles, including geostationary and low-orbit satellites for communications, remote sensing and scientific missions; ground- and air-launched rockets that deliver satellites into orbit; and missile defense boosters that are used as interceptor and target 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: Public and Investor Relations: Barron Beneski of Orbital Sciences Corporation, +1-703-406-5528 or Beneski.barron@orbital.com.

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SOURCE Orbital Sciences Corporation

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

URL:              http://www.orbital.com
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