STS-115 Commander Brent Jett introduces his crew to waiting media at KSC's Shuttle Landing Facility after their arrival from Houston. At left are Mission Specialists Daniel Burbank, Steven MacLean and Joseph Tanner; at right are Mission Specialist Heidemarie Stefanyshyn-Piper and Pilot Christopher Ferguson. The STS-115 crew has flown to NASA's Kennedy Space Center to take part in Terminal Countdown Demonstration Test activities. The TCDT is a pre-launch preparation that includes practicing emergency egress from the pad, driving an M-113 armored personnel carrier, and simulating the launch countdown. Launch of STS-115 is currently scheduled for Aug. 27. Photo credit: NASA/George Shelton