Airman 1st Class Charles Song, 9th Civil Engineer Squadron heating, ventilation and air conditioning technician, inspects electrical connections to determine the cause of systems malfunction at Beale Air Force Base, California, Aug. 2, 2018. HVAC Airmen are required to wear personal protective equipment when working on systems that have hazards such as refrigeration high pressure and units with up to 480 voltages. (U.S. photo by Senior Airman Justin Parsons)
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