Stock Photo - Astronauts Mark Polansky (left), STS-127 commander; Doug Hurley, pilot; and Christopher Cassidy, mission specialist, are pictured during a cake-cutting ceremony in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center.

Stock Photo: Astronauts Mark Polansky (left), STS-127 commander; Doug Hurley, pilot; and Christopher Cassidy, mission specialist, are pictured during a cake-cutting ceremony.

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