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Astronauts Andrew S. W. Thomas (left seated), STS-102 mission specialist; Carl E. Walz and Daniel W. Bursch, both Expedition Four flight engineers; and cosmonaut Yuri I. Onufrienko, mission commander, exchange conversation prior to a mission training session in the Space Vehicle Mockup Facility at the Johnson Space Center (JSC). The crew members are attired in training versions of the shuttle launch and entry suit. Onufrienko represents Rosaviakosmos