The Astrovan carrying the STS-135 crew; Chris Furgeson, commander, Doug Hurley, pilot, and mission specialists Rex Walheim and Sandy Mangus, rolls toward launch pad 39a and space shuttle Atlantis, Friday, July 8, 2011, at Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)