Practicing emergency egress STS-118 Mission Specialists Tracy Caldwell are seated in a slidewire basket.

Practicing emergency egress from Launch Pad 39A, STS-118 Mission Specialists Tracy Caldwell (left) and Rick Mastracchio are seated in a slidewire basket in the foreground. Others in the background include Mission Specialist Barbara R. Morgan (center). Other crew members are Commander Scott Kelly, Pilot Charlie Hobaugh and Mission Specialists Dave Williams and Alvin Drew. Morgan joined NASA's Teacher in Space program in 1985 and was selected as an astronaut in 1998. Williams represents the Canadian Space Agency. The STS-118 mission on Space Shuttle Endeavour is the 22nd flight to the International Space Station and will carry a payload including the S5 truss, a SPACEHAB module and external stowage platform 3. STS-118 is targeted for launch on Aug. 7. Photo credit: NASA/George Shelton