NASA International Space Station Expedition 51 Soyuz MS-04 mission backup crew members Russian cosmonaut Sergey Ryazanskiy of Roscosmos (left) and American astronaut Randy Bresnik report to State Commission officials during the pre-launch final crew qualification exams at the Gagarin Cosmonaut Training Center March 30, 2017 in Star City, Russia. (photo by Rob Navias /NASA via Planetpix)

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