Prior to the Challenger disaster, the Department of Defense planned to launch the Shuttle from the U.S. West Coast, Space Launch Complex 6, Vandenberg Air Force Base, California, on military Space Shuttle missions, but that was scrapped after the STS-51-L tragedy in 1986.

Spaceflight Now posted some neat photos in seven galleries, of the prototype Space Shuttle Enterprise (OV-101) in Vandenber's Orbiter Maintenance and Checkout Facility hangar, and standing assembled with external...