Senior Airman Nicholas Macdonald performs a night-vision goggle inspection Aug. 8, 2013, at Joint Base Charleston, S.C. Airmen from Shaw Air Force Base, S.C., conducted the training here because their night-vision inspection equipment was undergoing maintenance. Macdonald is a precision measurement equipment laboratory calibration technician assigned to the 20th Component Maintenance Squadron. (U.S. Air Force photo by Senior Airman Dennis Sloan)
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