Expedition 31 Soyuz Commander Gennady Padalka, bottom, NASA Flight Engineer Joseph Acaba and Flight Engineer Sergei Revin, top, wave farewell from the base of the Soyuz rocket at the Baikonur Cosmodrome in Kazakhstan, Tuesday, May 15, 2012. The launch of the Soyuz spacecraft with Padalka, Revin, and Acaba is scheduled for 9:01 local time on Tuesday, May 15. Photo Credit (NASA/Bill Ingalls) Expedition 31 crew wave goodbye

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