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The STS-113 crew pause for a photo after test drives in the M-113 armored personnel carrier behind them. From left are Mission Specialist Michael Lopez-Alegria, Pilot Paul Lockhart, Commander James Wetherbee and Mission Specialist John Herrington. Driving the M-113 is part of emergency egress training at the pad, one of the Terminal Countdown Demonstration Test activities in preparation for launch. The TCDT also includes a simulated launch countdown. The primary payloads on mission STS-113 are the first port truss segment, P1, and the Crew and Equipment Translation Aid (CETA) Cart B. Once delivered, the P1 truss will remain stowed until flight 12A.1 in 2003 when it will be attached to the central truss segment, S0, on the Space Station. Also onboard Space Shuttle Endeavour will be the Expedition 6 crew who will replace Expedition 5, returning to Earth after 4 months.