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ISS024-E-011600
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ISS024-E-011600

June 1, 2014
(7 Aug. 2010) --- Attired in their Extravehicular Mobility Unit (EMU) spacesuits, NASA astronauts Doug Wheelock and Tracy Caldwell Dyson (bottom), both Expedition 24 flight engineers, prepare to exit the Quest airlock of the International Space Station to begin the first of three planned spacewalks to remove and replace an ammonia pump module that failed July 31.


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