Press and guest watch from outside the perimeter of Launch Pad 39a as the space shuttle Atlantis is revealed during the rotating service structure (RSS) is rolled back on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)