Expedition 31 Flight Engineer Joe Acaba waves farewell to friends and family as his bus departs the Cosmonaut Hotel with fellow Expedition 31 crew members, Commander Gennady Padalka and Sergei Revin on Tuesday, May 15, 2012 in Baikonur, Kazakhstan. The Soyuz spacecraft with Expedition 31 Soyuz Commander Gennady Padalka, Flight Engineer Sergei Revin, and Acaba onboard launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit: (NASA/GCTC/Andrey Shelepin)