Orbital Names Mark Pieczynski to Company's Management Team

-- Pieczynski Appointed Vice President of Southern California
Engineering Center in Huntington Beach, CA --
DULLES, Va.--(Business Wire)--
Orbital Sciences Corporation (NYSE:ORB) has named Mr. Mark A.
Pieczynski as Vice President of the company's new Southern California
Engineering Center in Huntington Beach, CA. In his position, Mr.
Pieczynski will oversee the technical support provided to Orbital's
various launch vehicle and space systems programs from the company's
newest facility, as well as being responsible for on-site staff
management and development. In particular, Mr. Pieczynski will support
the company's strategic goal of evolving the new Huntington Beach
engineering facility to be a center of excellence for liquid rocket
propulsion.

Since 1995, Mr. Pieczynski has held a series of senior-level
positions on Delta launch vehicle programs for McDonnell Douglas, The
Boeing Company and, most recently, United Launch Alliance (ULA) that
included responsibility for engineering, manufacturing and launch site
activities, as well as contractual and financial matters. From 1995 to
2002, he served as the Program Manager for the deployment of Iridium
low-Earth orbit communications satellites aboard Delta II rockets. In
2002, he was promoted to Director of U.S. Air Force Delta II Programs,
overseeing the launch of military spacecraft for the U.S. Department
of Defense and its agencies such as the National Reconnaissance
Office, Defense Advanced Research Projects Agency and Naval Research
Laboratory.

For the past 15 months, Mr. Pieczynski served as the Delta Program
Site Executive in Southern California, overseeing a workforce of over
900 ULA employees. He was responsible for coordinating the transition
process for the ULA employees at the Huntington Beach location while
all Delta rocket programs were being moved to ULA's new Denver, CO
location. His areas of responsibility in that process included
maintaining a program knowledge base to successfully transition the
programs, serving as the primary interface between Boeing and ULA, and
overseeing all employee-related transition activities for those
employees who chose to relocate and those who chose not to transfer to
the Denver location.

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 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 government agencies
and laboratories.

Orbital Sciences Corporation
Barron Beneski, 703-406-5528
Public and Investor Relations
beneski.barron@orbital.com

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