(05/17/2002) -- The Expedition 5 crew poses during suitup prior to going to the launch pad for a simulated countdown. From left are astronaut Sergei Treschev, astronaut Peggy Whitson and Commander Valeri Korzun. Treschev and Korzun are with the Russian Space Agency. The simulation is part of STS-111 Terminal Countdown Demonstration Test activities, which also includes the mission crew Commander Kenneth Cockrell, Pilot Paul Lockhart and Mission Specialists Franklin Chang-Diaz and Philippe Perrin, with the French Space Agency. The payload on the mission to the International Space Station includes the Mobile Base System, an Orbital Replacement Unit and Multi-Purpose Logistics Module Leonardo. The Expedition 5 crew is traveling on Endeavour to replace the Expedition 4 crew on the Station. Launch of Endeavour is scheduled for May 30, 2002.