JSC2011-E-068773 (22 July 2011) --- NASA astronaut Chris Ferguson, STS-135 commander, listens as a crewmate addresses the crowd during a July 22 welcome home ceremony for the crew of the space shuttle Atlantis at Ellington Field in Houston. STS-135 is the final mission of the NASA Space Shuttle Program. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool