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KENNEDY SPACE CENTER, FLA. -- The STS-110 crew walks out of the Operations and Checkout Building on their way to the launch pad for a simulated launch countdown. From the rear, left row, are Mission Specialists Jerry Ross and Rex Walheim, Pilot Stephen Frick; right row, Mission Specialists Steven Smith, Lee Morin and Ellen Ocho, 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