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Tech. Sgt. Jonathan Carr, a crew chief with the 62nd Aircraft Maintenance Squadron, Joint Base Lewis-McChord, Wash., checks the engine of a C-17 Globemaster III during Exercise Mobility Guardian at Joint Base Lewis-McChord, Wash., Aug. 6, 2017. The exercise is intended to test the abilities of the Mobility Air Forces to execute rapid global mobility missions in dynamic, contested environments. (U.S. Air Force photo/Tech. Sgt. Nathan Lipscomb)

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Photo by: Tech. Sgt. Nathan Lipscomb |  VIRIN: 170806-F-XD880-705.JPG