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U.S. Air Force Airman 1st Class Aaron Brewer, 23d Equipment Maintenance Squadron crew chief, uses a calibration machine during an isochronal inspection, May 31, 2016, at Moody Air Force Base, Ga. ISO inspections include breaking down an aircraft piece-by-piece in a hangar before performing systems checks on the flightline. (U.S. Air Force photo by Airman Daniel Snider/Released)