Specialists Tom Marshburn Tim Kopra and Dave Wolf hold onto the slidewire basket as they practice emergency exit procedures.

On Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-127 Mission Specialists Tom Marshburn, Tim Kopra and Dave Wolf hold onto the slidewire basket as they practice emergency exit procedures that are part of the terminal countdown demonstration test, which concluded with a simulated launch countdown. Endeavour's STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex on the International Space Station. Endeavour's launch is scheduled for June 13 at 7:17 a.m. EDT. Photo credit: NASA/Kim Shiflett