(03/19/2002) -- The STS-110 crew takes a break on the launch pad during Terminal Countdown Demonstration Test activities to pose for a photo. Standing left to right are Pilot Stephen Frick, Mission Specialist Ellen Ochoa, Commander Michael Bloomfield, and Mission Specialists Lee Morin, Rex Walheim, Steven Smith and Jerry Ross. The TCDT, which includes emergency egress training and a simulated launch countdown, 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