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STS-110 Pilot Stephen Frick waits inside the M-113 armored personnel carrier to begin training on driving the vehicle, which is part of Terminal Countdown Demonstration Test activities. TCDT includes emergency egress training and a simulated launch countdown. The TCDT is held at KSC prior to each Space Shuttle flight. Scheduled for launch April 4, the 11-day mission will feature Shuttle Atlantis docking with the International Space Station (ISS) and delivering the S0 truss, the centerpiece-segment of the primary truss structure that will eventually extend over 300 feet.