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