NASA astronaut Sandy Magnus, STS-135 mission specialist, participates in safety training in the M113 personnel carrier during the Terminal Countdown Demonstration Test (TCDT) at the Kennedy Space Center in Florida on Tuesday, June 21, 2011. TCDT serves as the prelaunch countdown rehearsal for the final space shuttle mission, which is scheduled for launch on July 8. The M113 would be used in the event of an emergency at the pad forcing the crew to evacuate. ( NASA Photo / Houston Chronicle, Smiley N. Pool ).

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Keywords: atlantis, exploration, final, launch, mission, nasa, news, shuttle, space, sts-135, training