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September 16, 2011
Attired in training versions of their shuttle launch and entry suits, astronauts Tracy E. Caldwell (left), STS-118 mission specialist; Clayton C. Anderson, Expedition 15 NASA space station science officer and flight engineer; Dafydd R. (Dave) Williams, representing the Canadian Space Agency, and Richard A. (Rick) Mastracchio, both STS-118 mission specialists, enjoy a light moment as they await an emergency egress training session in the Space Vehicle Mockup Facility at the Johnson Space Center.

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