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In the White Room, STS-100 Pilot Jeffrey S. Ashby chats with closeout crew members before he enters Space Shuttle Endeavour.   With his back to the camera is Rick Welty; second from left is Rene Arriens.  The White Room is an environmental chamber at the end of the Orbiter Access Arm that provides entry into the orbiter on the launch pad.  The  mission will deliver and integrate the Spacelab Logistics Pallet/Launch Deployment Assembly, which includes the Canadian-built Space Station Remote Manipulator System and the UHF Antenna.  Two spacewalks are planned for installation of the SSRMS, which will be performed by Mission Specialists Scott E. Parazynski and Chris A. Hadfield, who is with the Canadian Space Agency. The mission is also the inaugural flight of Multi-Purpose Logistics Module Raffaello, carrying resupply stowage racks and resupply/return stowage platforms.  Liftoff of Space Shuttle Endeavour on mission STS-100 is scheduled at 2:41 p.m. EDT April 19