DULLES, Va., Apr 25, 2002 /PRNewswire-FirstCall via COMTEX/ --

- Quick Reaction Launch Vehicle Supports Alaskan Command's Joint-Service Northern Edge 2002 Exercise -

Orbital Sciences Corporation (NYSE: ORB) announced today that it successfully launched a suborbital rocket, the Quick Reaction Launch Vehicle (QRLV-2), for the Air Force Space and Missile Systems Center (SMC) Detachment 12, Rocket Systems Launch Program (RSLP) Office located at Kirtland Air Force Base, New Mexico. The launch of the QRLV-2 originated from the Kodiak Launch Complex, Alaska on Wednesday, April 24. The QRLV-2 mission provided a realistic theater ballistic missile tracking target for the Alaskan Command's Joint-Service Northern Edge 2002 Exercise. The launch also served as a test platform for the U.S. Army Space and Missile Defense Command's (SMDC) experimental batteries, along with a device being developed by the University of Mississippi to measure acceleration, and the Air Force Research Laboratory's (AFRL) Ballistic Missile Range Safety Technology System (BMRST), which tracks and ensures that a launch vehicle stays within the confines of the launch range.

Under a Sounding Rocket Program (SRP-2) task order contract from the Air Force, Orbital designed, produced, integrated and launched the single-stage, guided QRLV-2 suborbital rocket. Program management, engineering and manufacturing efforts were conducted at Orbital's Launch Systems Group (LSG) facility in Chandler, Arizona. LSG also successfully launched the first QRLV- 1 mission on March 22, 2001 from the Kodiak Launch Complex in support of the Northern Edge 2001 Exercise.

"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, Executive Vice President and General Manager of Orbital's Launch Systems Group. "We are extremely pleased with the results of the QRLV-2 mission, our third successful launch for the Air Force in as many months, and look forward to providing the Air Force with continued support."

The SMC Detachment 12 Sounding Rocket Program supplies target vehicles that are used by the Air Force and other Department of Defense agencies for test beds for missile flight test experiments. QRLV-2 was the first launch vehicle task order executed under the SRP-2 indefinite delivery/indefinite quantity contract, which allows Orbital and three other qualified companies to compete for up to $96 million in task order launch services.

Orbital is one of the country's leading suppliers of launch vehicles for missile defense applications. The company's target vehicles are used to support numerous Department of Defense programs, including SMD programs and the U.S. Army's THAAD, PAC-3, CMP and SRALT programs. 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, geosynchronous 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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