U.S. Air Force Airman Gianni Galvan, 51st Civil Engineer Squadron heating, ventilation and air-conditioning technician, fixes a building’s AC unit at Osan Air Base, Republic of Korea on August 9, 2017. The Osan HVAC shop is responsible for almost 600 facilities on base and 4,700 single occupancy dorms. (U.S. Air Force photo by Airman 1st Class Gwendalyn Smith)