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Mission Specialist (MS) Rex J. Walheim uses a Pistol Grip Tool (PGT) while working on the U.S. Laboratory / Destiny during the first Extravehicular Activity (EVA) of the STS-110 mission. Walheim is being assisted by a Portable Foot Restraint (PFR) and the Space Station Remote Manipulator System (SSRMS) / Canadarm2. The Earth provides a nice background to this image.