Security monitors the Soyuz simulator as Expedition 53 crew members: Joe Acaba of NASA, Alexander Misurkin of Roscosmos, and Mark Vande Hei of NASA are inside for their final qualification exams, Thursday, Aug. 31, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

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