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New observations of the Air Force
Air Force X-37B Robotic Space Plane: Nearing Record Flight
World Air & Space Forces Magazine
Strange little shuttle: why does the Pentagon launch the X-37B again
Military Space Plane Wings Toward Year in Earth Orbit (Updated)
Why the Russian Space Plane Won't Fly
Air Force TV
Secret space plane could evolve to carry astronauts
Photographed: The U.S. Air Force's Secretive Robot X-37B Space Shuttle
Unmanned spacecraft Boeing X-37B spent in space for more than 700 days