Expedition 53 flight engineer Joe Acaba of NASA dons his Sokol suit ahead of his Soyuz qualification exams with Alexander Misurkin of Roscosmos and Mark Vande Hei of NASA, Thursday, Aug. 31, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

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