The crew of STS-135, from left, NASA astronauts Chris Ferguson, commander; Doug Hurley, pilot; and Sandy Magnus and Rex Walheim, both mission specialists, wave to the crowd gathered at Ellington Field during a July 22 welcome home ceremony for the Atlantis crew. STS-135 is the final mission of the NASA Space Shuttle Program. Photo credit: NASA photo/Houston Chronicle, Smiley N. Pool