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KENNEDY SPACE CENTER, Fla. -- On an upper level of the Pad 39A fixed service structure, the STS-118 crew members get directions about using the slidewire basket that is part of the emergency egress system. At right, Mission Specialist Tracy Caldwell identifies the pull lever to release the basket. At far left is Mission Specialist Dave Williams, who represents the Canadian Space Agency. At center is Mission Specialist Alvin Drew. The crew is at Kennedy for terminal countdown demonstration test, or TCDT, training activities. Those activities include M-113 training, payload familiarization, the emergency egress training at the pad and a simulated launch countdown. The mission is the 22nd flight to the International Space Station and Space Shuttle Endeavour 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. NASA/George Shelton