TCDT Astronaut Walkout

From left, Pilot Doug Hurley, Mission Specalist Rex Walheim, Commander Chris Ferguson and Mission Specialist Sandy Magnus (not pictured), walk towards the Astrovan during a training simulation known as Terminal Count Down Test or TCDT at Kennedy Space Center, Cape Canaveral, Fla, on June 23, 2011. (Rayiaz Khan/Correspondent)

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