DULLES, Va.March 26, 2004--

Key Partners Recognized for Outstanding Contributions in the Areas of Product Reliability, On-Time Delivery and Customer Support

Orbital Sciences Corporation (NYSE:ORB) today announced the recipients of the company's first Annual Supplier Achievement Awards. Beginning with Orbital's Launch Systems Group (LSG), which designs, develops, manufactures and operates a wide variety of rockets for space launch missions and missile defense applications, the company recognized nine companies and one individual for outstanding contributions in 2003 to Orbital-managed programs for military, civil government, commercial and international customers. This year, Orbital will expand the recognition program to include suppliers that contribute to the success of the company's Space Systems and Advanced Programs Groups, which produce the company's satellite and related space system products.

The award and recognition process is a part of a supplier development initiative that Orbital began in early 2003. The 2003 selection process was based on a combination of qualitative and quantitative analyses performed by LSG's integrated product teams. An innovative aspect to the selection process is the supplier feedback loop, which views performance through a supply chain continuum, independent of customer and/or supplier distinctions. The process identifies strengths and weaknesses in the supply chain, from the flow-down of customer requirements to the delivery of finished goods and services. The primary objective of the award program is to forge strong partnerships between Orbital and its suppliers to ensure the highest quality and timely delivery of launch vehicle components and subsystems.


Orbital recognized the following companies and program manager:


ATK THIOKOL PROPULSION                    SYSTEMS SUPPLIER OF THE YEAR
Brigham City and Magna, Utah

ATK Thiokol Propulsion was selected for the Systems Supplier of the
Year Award based on strong technical expertise, high product quality,
rigorous engineering practices and 100% on-time delivery of rocket
motors in 2003. ATK supplies solid rocket motors to Orbital for its
missile defense interceptor boosters and its line of commercial and
government space launch vehicles.


DRUCK, INC., SENSORS GROUP              COMPONENT SUPPLIER OF THE YEAR
New Fairfield, Connecticut

Druck, Inc.'s Sensors Group. was selected for the Component Supplier
of the Year Award based on on-time product delivery and quality, and
for its outstanding responsiveness and flexibility to meet Orbital's
demanding requirements. Druck supplies Orbital with flight
instrumentation devices.


ASTECH ENGINEERED PRODUCTS, INC.            TECHNICAL EXCELLENCE AWARD
A GKN Aerospace Chem-tronics Company
Santa Ana, California

Astech received the Technical Excellence Award for rapid development
of a new product designed specifically to meet Orbital's rigorous
flight requirements. Astech supplies an innovative, lightweight,
honeycomb-titanium missile shroud for Orbital's missile
defense-related programs.


CMC ELECTRONICS CINCINNATI                   GOLD AWARD FOR EXCELLENCE
Cincinnati, Ohio

CMC Electronics Cincinnati received a Gold Award for Excellence based
on a high level of engineering strength and responsiveness,
flexibility, on-time product delivery and support services to Orbital.
CMC Electronics Cincinnati supplies command destruct receivers used
aboard Orbital's launch vehicles.


MAROTTA SCIENTIFIC CONTROLS                  GOLD AWARD FOR EXCELLENCE
Montville, New Jersey

Marotta Scientific Controls received the Gold Award for Excellence
based on high product reliability, on-time delivery and support
services for the pressure regulators that it supplies for use aboard
Orbital's launch vehicles.


ARDE, INC.                                   GOLD AWARD FOR EXCELLENCE
Norwood, New Jersey

Employee-owned Arde, Inc. received the Gold Award for Excellence based
on reliability, schedule adherence and product support for the
pressure vessels used aboard Orbital's launch vehicles.


MICRO POWER ELECTRONICS, INC.                GOLD AWARD FOR EXCELLENCE
Hillsboro, Oregon

Micro Power Electronics, Inc. received the Gold Award for Excellence
for outstanding on-time delivery and product service. It is the second
award that Micro Power Electronics has received from Orbital. In 2002,
Micro Power was recognized with an Extra Mile Award for benchmark
service and support. Micro Power supplies battery packs for Orbital's
launch vehicles.


BF GOODRICH                                          PHOENIX AWARD FOR
FUEL AND UTILITY SYSTEMS DIVISION               CONTINUOUS IMPROVEMENT
Vergennes, Vermont

Orbital recognized the BF Goodrich Fuel and Utility Systems Division
with the Phoenix Award based on a consistent and successful record of
incorporating process improvements into their manufacturing flow to
better support Orbital's rigorous requirements. In 2003, BF Goodrich's
performance on Orbital programs reflected a dramatic improvement in
service through strong management commitment to customer satisfaction
and continuous process improvement. BF Goodrich Fuel and Utility
Systems supplies launch vehicle actuators to Orbital.


MARY REINERT                                  PROGRAM MANAGEMENT AWARD
ENSIGN-BICKFORD AEROSPACE
 AND DEFENSE COMPANY
Simsbury, Connecticut

In a special recognition, Orbital awarded Ms. Mary Reinert of the
Ensign-Bickford Aersopace and Defense Company with a Program
Management Award. Orbital rarely confers awards to individuals at
supplier companies. However, Ms. Reinert's extensive and consistent
history of providing excellent program management in support of
multiple launch vehicle products, systems and services, has warranted
this special award. Ensign-Bickford supplies ordnance products used
aboard Orbital's missile defense and space launch vehicles.

About Orbital

Orbital develops and manufactures small space and rocket systems for commercial, military and civil government customers. The company's primary products are satellites and launch vehicles, including low-orbit, geosynchronous and planetary spacecraft for communications, remote sensing, scientific and defense 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 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.


    CONTACT: Orbital Sciences Corporation
             Barron Beneski, 703-406-5528
             Beneski.barron@orbital.com

    SOURCE: Orbital Sciences Corporation