DULLES, Va.Dec. 23, 2013-- Orbital Sciences Corporation (NYSE: ORB), one of the world s leading space technology companies, today announced that Mr. Tom McCabe will join the company as Senior Vice President, General Counsel and Secretary, effective January 6, 2014. He will direct Orbital s legal, ethics and compliance, and regulatory affairs functions and will be based at the company s headquarters in Dulles, Virginia.

Mr. McCabe is currently Senior Vice President and General Counsel at Alion Sciences and Technology Corporation in Washington, D.C. Previously, he was Vice President and Deputy General Counsel at XM Satellite Radio and held senior legal and financial positions at GRC International, Inc. Earlier in his career, Mr. McCabe was a partner in the law firm of McCarthy and Burke and served as a judicial law clerk to Judge C.R. Richey in U.S. District Court. He holds JD and MBA degrees from the University of Notre Dame and a BA degree from Georgetown University.

I am very happy to welcome Tom to Orbital, said Mr. David W. Thompson, Orbital s President and Chief Executive Officer. He has over 20 years of experience in senior legal and operating positions at several high-technology companies, complementing a decade of prior work at law firms and federal court. I am confident that Tom will make major contributions to the company s success in the years ahead, Mr. Thompson added.

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. More information about Orbital can be found at http://www.orbital.com.

Source: Orbital Sciences Corporation

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