U.S. Airmen assigned to the 51st Civil Engineer Squadron heating, ventilating and air conditioning flight work on daily tasks in their shop at Osan Air Base, Republic of Korea, July 30, 2018. Throughout the summer, HVAC Airmen routinely work in temperatures above 100 degrees to ensure base residents have functioning air conditioning in their areas of rest and relaxation. (Courtesy photo by Master Sgt. Michael Holmes)