NASA astronaut Chris Ferguson dons his training version of a shuttle launch and entry suit at NASA's Johnson Space Center.

NASA astronaut Chris Ferguson, left, STS-135 commander, dons his training version of a shuttle launch and entry suit before participating in a post-insertion training session with NASA astronauts Doug Hurley, pilot, and Sandy Magnus, mission specialist, March 24, 2011, in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center in Houston. Hurley and Magnus are wearing their liquid-cooled undergarments for the orange suit. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool