Senior Airman David McMillen, 28th Civil Engineer Squadron heating, ventilation, and air conditioning technician, monitors the amount of refrigerant entering a chiller during maintenance at the base air traffic control tower on Ellsworth Air Force Base, , June 28, 2012. By adding refrigerant, the Airmen are preventing the chiller from possibly freezing up and costing thousands of dollars to replace. Airman 1st Class Kate Thornton

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Size: 1290px × 1938px
Photo credit: © PJF Military Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: .., 1st, 28, 28th, a1c, afb, air, airforce, airman, base, ces, civil, class, dakota, ellsworth, engineer, force, group, katherine, military, mission, msg, south, squadron, states, support, thornton, united, usa, usaf