RBITAL SUCCESSFULLY LAUNCHES MINOTAUR I ROCKET CARRYING ORS-1 SATELLITE FOR THE U.S. AIR FORCE

WI-NFIRE 3

— Flight Extends Perfect Launch Record of Minotaur Rockets to 21
Consecutive Missions —

(Dulles, VA 30 June 2011) — Orbital Sciences Corporation (NYSE: ORB)
announced today that its Minotaur I rocket successfully launched the
Department of Defense Operationally Responsive Space Office’s ORS-1
satellite. The mission originated yesterday evening, June 29, from the
Mid-Atlantic Regional Spaceport (MARS) launch facility at NASA’s Wallops
Flight Facility on Wallops Island, VA. At approximately 11:09 p.m. EDT,
the rocket’s first stage ignited, beginning its flight into low-Earth
orbit. Following the flight of the four-stage rocket, the ORS-1 spacecraft
was deployed into its intended orbit.

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Yesterday’s mission was the 21st mission for the Minotaur program since its
first launch in 2000, all of which have been successful. It was also the
fourth Minotaur I launch from the MARS facility, following the TacSat-2,
NFIRE and TacSat-3 missions conducted from the Eastern Virginia launch site
in 2006, 2007 and 2009, respectively. Including the ORS-1 mission,
Minotaur I rockets have deployed a total of 33 satellites into orbit. The
overall launch service and management for the Minotaur I vehicle was
provided by the Air Force Space and Missile Systems Center’s Space
Development and Test Directorate at Kirtland Air Force Base, NM.

“We are very pleased with the results of this evening’s flight of the
Minotaur I rocket, and are proud to be able to support the Department of
Defense’s important work in the area of Operationally Responsive Space
(ORS) systems,” said Mr. Ron Grabe, Orbital’s Executive Vice President and
General Manager of its Launch Systems Group. “Following this successful
launch, our Minotaur launch team’s focus will shift to the Minotaur IV
vehicle, which is scheduled to conduct two launches later this year,
including the HTV-2b mission for DARPA and the TacSat-4 mission for the Air
Force.”

The ORS-1 satellite is the Operationally Responsive Space Office’s first
operational prototype spacecraft. Its rapid development and deployment is
an important step toward demonstrating the capability to meet emerging and
persistent warfighter needs on operationally relevant timelines.

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