Stock Photo - NASA astronauts Jeffrey Williams, Expedition 21 flight engineer and Expedition 22 commander; and Shannon Walker, Expedition 2425 flight engineer, participate in an extravehicular activity (EVA) preparation and post EVA training session in an ISS mock-uptrainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. EVA Systems instructor Grant Slusser (right) assisted Williams and Walker.

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