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KENNEDY SPACE CENTER, Fla. -- STS-91 Mission Specialist Valery Ryumin, with the Russian Space Agency, reaches for a lever which releases a slidewire basket as Mission Commander Charles Precourt looks on during Terminal Countdown Demonstration Test (TCDT) training activities at the 195-foot level of Launch Complex 39A. The crew is practicing emergency egress procedures during the TCDT, a dress rehearsal for launch. STS-91 is scheduled to be launched on June 2 with a launch window opening around 6:10 p.m. EDT. The mission will feature the ninth Shuttle docking with the Russian Space Station Mir, the first Mir docking for Discovery, the conclusion of Phase I of the joint U.S.-Russian International Space Station Program, and the first flight of the new Space Shuttle super lightweight external tank. The STS-91 flight crew also includes Pilot Dominic Gorie and Mission Specialists Wendy B. Lawrence; Franklin Chang-Diaz, Ph.D.; and Janet Kavandi, Ph.D. Andrew Thomas, Ph.D., will be returning to Earth with the crew after living more than four months aboard Mir