NASA flight engineer Joe Acaba is seen training in a mockup of the International Space Station Zvezda service module, Monday, April 23, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Acaba, Soyuz commander Gennady Padalk and flight engineer Sergei Revin are set to launch May 15 from the Baikonur Cosmodrome in their Soyuz TMA-04M spacecraft to the International Space Station. Photo Credit: (NASA/Carla Cioffi) Zvezda Service Module mock-up at the Gagarin Cosmonaut Training Center

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