Expedition 51 crewmember Fyodor Yurchikhin for the second of two days of of final qualification exams.

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 51 crewmember Fyodor Yurchikhin of the Russian Federal Space Agency (Roscosmos, left) smiles as his crew mate, Jack Fischer of NASA (right) signs in March 31 for the second of two days of of final qualification exams. Yurchikhin and Fischer will launch April 20 on the Soyuz MS-04 spacecraft from the Baikonur Cosmodrome in Kazakhstan for a four and a half month mission on the International Space Station. Expedition 51. Photo: Rob Navias/NASA.