The crew arrives to take part in the Terminal Countdown Demonstration Test TCDT a preparation for the launch to the International Space Station.

The STS-117 crew arrives at NASA's Kennedy Space Center to take part in the Terminal Countdown Demonstration Test (TCDT), a preparation for the launch March 15 to the International Space Station. From left at the Shuttle Landing Facility are Mission Specialists James Reilly, Danny Olivas, Steven Swanson and Patrick Forrester, Pilot Lee Archambault and Commander Rick Sturckow. The TCDT includes emergency egress training and a simulated launch countdown.The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Kim Shiflett