A Russian security officer is seen as the Soyuz MS-04 spacecraft is rolled out to the launch pad by train on Monday, April 17, 2017 at the Baikonur Cosmodrome in Kazakhstan. Launch of the Soyuz rocket is scheduled for April 20 and will carry Expedition 51 Soyuz Commander Fyodor Yurchikhin of Roscosmos and Flight Engineer Jack Fischer of NASA into orbit to begin their four and a half month mission on the International Space Credit: (NASA/Aubrey Gemignani)

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Keywords: 51, aubrey, baikonur, cosmodrome, expedition, gemignani, kazakhstan, ms-04, nasa, officer, preflight, rollout, russian, security, soyuz, train