Senior Airman Nicholas Macdonald, 20th Component Maintenance Squadron Precision Measurement Equipment Laboratory Calibration technician from Shaw Air Force Base, S.C., performs a night vision goggle inspection Aug. 8, 2013, at the 437th Maintenance Group PMEL shop at Joint Base Charleston – Air Base, S.C. The airmen from Shaw AFB conducted the training here because their night vision inspection equipment was undergoing maintenance. The airmen confirmed that the optics in the night vision equipment work properly. (U.S. Air Force photo/ Senior Airman Dennis Sloan)