At the Gagarin Cosmonaut Training Center at Star City Russia prepare for their farewell sendoff to the Baikonur Cosmodrome in Kazakhstan.

At the Gagarin Cosmonaut Training Center at Star City, Russia on May 2, 2012, the prime crew members who will round out Expedition 31 on the International Space Station prepare for their farewell sendoff to the Baikonur Cosmodrome in Kazakhstan. From left to right are Flight Engineer Sergei Revin, Soyuz Commander Gennady Padalka, and NASA Flight Engineer Joe Acaba. The three are scheduled to launch to the space station on May 15 in their Soyuz TMA-04M spacecraft.

NASA/Stephanie Stoll