Staff Sgt. Darren Cook, 316 CES HVAC craftsman, left, teaches Airman 1st Class Brett Elan, 316 CES apprentice, how to properly charge an air conditioning chiller with refrigerant and manifold gauges outside the Squadron Operations Building.(US Air Force/Bobby Jones)

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Photo by: Jones |  VIRIN: 080710-F-6072J-004.JPG