Practice the crew gathers on the level of the fixed service structure on Launch Pad 39B.

Following a simulated launch countdown and emergency egress practice, the STS-115 crew gathers on the 215-foot level of the fixed service structure on Launch Pad 39B. From left are Pilot Christopher Ferguson, Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner, Commander Brent Jett, and Mission Specialists Steven MacLean and Daniel Burbank. MacLean is with the Canadian Space Agency. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston