JSC2011-E-068995 (21 July 2011) --- The crew of STS-135 left this plaque in the cockpit of Atlantis as a tribute to all of the people who have worked on the Space Shuttle Program. Photo credit: NASA

JSC2011-E-068747 (24 June 2011) --- This picture was taken during a fit test on June 24, 2011 in the shuttle's Fixed Base Trainer in the Jake Garn Mission Simulation and Training Facility at the Johnson Space Center. When the mission was complete, the STS-135 crew left the plaque in the cockpit of Atlantis as a tribute to all of the people who have worked on the Space Shuttle Program. Photo credit: NASA

STS-135 mission specialist Sandra Magnus, has some make up applied prior to her appearance on CNN American Morning, Tuesday, Aug. 16, 2011, in New York City. The crew from space shuttle Atlantis (STS-135) is in New York City for a three-day visit. Photo Credit: (NASA/Paul E. Alers)

201108160008hq (16 Aug. 2011) --- Stephen Colbert, host of The Colbert Report, salutes the crew of STS-135, seated from lower left, NASA astronauts Chris Ferguson, commander; Doug Hurley, pilot; Sandy Magnus and Rex Walheim, both mission specialists, during their appearance for a taping of his television show, Aug. 16, 2011, in New York. The astronauts from STS-135 are in New York for a three-day visit. Photo credit: NASA/Paul E. Alers