STS135-S-195 (21 July 2011) --- NASA astronaut Chris Ferguson, STS-135 commander, leads his crew out of the Crew Transport Vehicle (CTV) following brief and standard medical checks. Behind Ferguson are NASA astronauts Doug Hurley, pilot; Sandy Magnus and Rex Walheim, both mission specialists. The final four astronauts of NASA's Space Shuttle Program brought space shuttle Atlantis home to the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida at 5:57 a.m. (EDT) on July 21, 2011. Atlantis' final return from space completed a 13-day, 5.2-million-mile journey to the International Space Station. STS-135 delivered spare parts, equipment and supplies in the Raffaello multi-purpose logistics module that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. Photo credit: NASA