STS-135 crewmembers Chris Ferguson, Doug Hurley and Rex Walheim

JSC2011-E-024187 (1 March 2011) --- NASA astronauts Chris Ferguson (right), STS-135 commander; Rex Walheim (center), mission specialist; and Doug Hurley, pilot, are pictured in the check-out facility at Ellington Field near NASA's Johnson Space Center prior to a flight in NASA T-38 trainer jets. Photo credit: NASA or National Aeronautics and Space Administration