Senior Airman Steven Williams, 51st Civil Engineer Squadron heating, ventilation, air condition and refrigeration journeyman, performs maintenance on an AC unit at Osan Air Base, Republic of Korea, Aug. 14, 2014. The HVAC shop is in charge of making sure all the AC units on base are working properly. (U.S. Air Force photo by Senior Airman Matthew Lancaster)

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Photo by: Senior Airman Matthew Lancaster |  VIRIN: 140814-F-HG907-164.JPG