JSC2011-E-040204 (2 March 2011) --- NASA astronaut Chris Ferguson, STS-135 commander, prepares for departure from Moffett Field in a T-38 trainer home to Houston after the crew of STS-135 trained in the Vertical Motion Simulator (VMS) at NASA's Ames Research Center in Mountain View, Calif. on March 2, 2011, Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

JSC2011-E-040199 (2 March 2011) --- NASA astronaut Rex Walheim, STS-135 mission specialist, exits the Vertical Motion Simulator (VMS) at NASA's Ames Research Center in Mountain View, Calif. after what is scheduled to be the crew's final training session in the simulator March 2, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

JSC2011-E-040201 (2 March 2011) --- NASA astronaut Doug Hurley pilots a simulated landing at the Kennedy Space Center as the STS-135 crew trains in the Vertical Motion Simulator (VMS) at NASA's Ames Research Center in Mountain View, Calif. on March 2, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

JSC2011-E-040243 (2 March 2011) --- NASA astronaut Chris Ferguson, STS-135 commander, prepares for departure from Moffett Field as he flies a T-38 trainer home to Houston after the crew of STS-135 trained in the Vertical Motion Simulator (VMS) at NASA's Ames Research Center on March 2, 2011, in Mountain View, Calif. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

JSC2011-E-040202 (2 March 2011) --- NASA astronaut Chris Ferguson, STS-135 commander, departs from the Moffett Field (Calif.) flight operations center for his trip home to Houston after he and his crew trained in the Vertical Motion Simulator (VMS) at NASA's Ames Research Center in Mountain View, March 2, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

JSC2011-E-040200 (2 March 2011) --- The landing approach to the Kennedy Space Center is seen in a heads up display as the STS-135 crew trains in the Vertical Motion Simulator (VMS) at NASA's Ames Research Center in Mountain View, Calif., on March 2, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

JSC2011-E-040205 (2 March 2011) --- A NASA T-38 jet trainer piloted by astronaut Chris Ferguson, STS-135 commander, takes off from Moffett Field in California for a flight home to Houston after Ferguson and his crew trained in the Vertical Motion Simulator (VMS) at NASA's Ames Research Center in Mountain View, March 2, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool