Joe Acaba and Sergei Revin walk past their Soyuz booster rocket to the International Space Station.

At the Baikonur Cosmodrome in Kazakhstan, Expedition 31/32 Flight Engineer Joe Acaba of NASA (left), Soyuz Commander Gennady Padalka (center) and Flight Engineer Sergei Revin walk past their Soyuz booster rocket in the Cosmodrome’s integration facility May 3, 2012 following a suited “fit check” dress rehearsal of launch day activities in advance of their launch May 15 to the International Space Station. Acaba, Padalka and Revin will spend four months aboard the orbital outpost.

NASA/Victor Zelentsov