Atlantis: Ready for Launch
Credit: AP
Astronaut Sandy Mangus, a crew member on space shuttle Atlantis, jokes with members of the media before going through safety training in the M113 personnel carrier 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)
