Stock Photo - Inside the Quest airlock of the International Space Station, NASA astronauts Steve Swanson (left) and Rick Mastracchio, both Expedition 39 flight engineers, participate in a dress rehearsal for an upcoming spacewalk during which they are to replace a failed backup computer relay box in the S0 truss.

Stock Photo: Inside the Quest airlock of the International Space Station, NASA astronauts Steve Swanson (left) and Rick Mastracchio, both Expedition 39 flight engineers.

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