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Station Astronauts Prep for U.S. Spacewalk

A trio of Expedition 36 flight engineers including NASA astronaut Chris Cassidy (left) and European Space Agency astronaut Luca Parmitano (right), are assisted by NASA astronaut Karen Nyberg, as they prepare for a "dry run" in the International Space Station's Quest airlock on July 3, 2013. Attired in their Extravehicular Mobility Unit (EMU) spacesuits, Cassidy and Parmitano gear up to participate in the first of two sessions of extravehicular (EVA) scheduled for July 9 and July 16, 2013.

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