Tech. Sgt. Michael Anderson, left, and Airman 1st Class Zachery Hatfield, both technicians assigned to the 99th Civil Engineer Squadron heating, ventilation, air conditioning and refrigeration shop, place a panel back onto an A/C unit at the 99th CES compound on Nellis Air Force Base, Nev., July 7, 2015. HVAC/R technicians are responsible for maintaining mechanical, electronic and pneumatic controls associated with refrigeration and cooling equipment. (U.S. Air Force photo by Staff Sgt. Victoria Sneed)
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