A Korean civilian attached to the 51st Civil Engineer Squadron heating, ventilation, air condition and refrigeration shop tightes a nut at Osan Air Base, Republic of Korea, Aug. 14, 2014. HVAC-R are responsible for installing, maintaining, repairing and operating furnaces, boilers, stoves, heat exchangers, burners, blowers, fans and radiant heaters. (U.S. Air Force photo by Senior Airman Matthew Lancaster)

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Photo by: Senior Airman Matthew Lancaster |  VIRIN: 140814-F-HG907-365.JPG