Stock Photo - NASA astronaut Tim Kopra, Expedition 46 flight engineer and Expedition 47 commander, participates in an extravehicular activity (EVA) maintenance training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.Lauren Harnett

Stock Photo: NASA astronaut Tim Kopra, Expedition 46 flight engineer and Expedition 47 commander, participates in an extravehicular activity (EVA) maintenance training.

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