Atlantis: Ready for Launch
Credit: AP
Space shuttle Atlantis commander Chris Ferguson prepares to drive the M113 personnel carrier for safety training during the Terminal Countdown Demonstration Test at the Kennedy Space Center in Cape Canaveral, Fla., Tuesday, June 21, 2011. The vehicle would be used by the crew in the event of an emergency at the pad during which the crew must make a quick exit from the area.(AP Photo/John Raoux)
