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KENNEDY SPACE CENTER, FLA. -- The STS-110 crew heads for the Astrovan to take them to the launch pad and a simulated launch countdown. From left are Mission Specialists Jerry Ross, Lee Morin, Steven Smith (rear), Rex Walheim and Ellen Ochoa; Pilot Stephen Frick and Commander Michael Bloomfield. The simulation is part of Terminal Countdown Demonstration Test activities. TCDT also includes emergency egress training and 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