Stock Photo - Expedition 31 backup crew members Kevin Ford, Oleg Novitskiy and Evgeny Tarelkin stand at attention before senior officials for their final qualification test in preparation for flight, April 23, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Expedition 31 Soyuz Commander Gennady Padalka, Flight Engineers Joe Acaba and Sergei Revin practiced similar scenarios nearby in advance of their final approval for launch to the International Space Station, scheduled for May 15, 2012.Carla Cioffi

Stock Photo: Expedition 31 backup crew members Kevin Ford, Oleg Novitskiy and Evgeny Tarelkin stand at attention before senior officials for their final qualification test.

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