Stock Photo - Expedition 31 crew members take a break from training at NASA's Johnson Space Center to pose for a crew portrait. Pictured on the front row are Russian cosmonauts Oleg Kononenko (right), commander; and Gennady Padalka, flight engineer. Pictured from the left (back row) are NASA astronaut Joe Acaba, Russian cosmonaut Sergei Revin, European Space Agency astronaut Andre Kuipers and NASA astronaut Don Pettit, all flight engineers.

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