STS-135 Mission Specialist Rex Walheim walks under the space shuttle Atlantis shortly after he and the rest of the STS-135 crew landed at NASA's Kennedy Space Center Shuttle Landing Facility (SLF), completing a 13-day mission to the International Space Station (ISS) and the final flight of the Space Shuttle Program, early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)
