Senior Airman Derek Hunter, 18th Civil Engineer Squadron Heating, Ventilation, Air Conditioning and Refrigeration technician, checks electrical circuits on a heating ventilation and cooling system April 21. Kadena recently instituted an initiative through the Air Force Smart Operations for the 21st Century program to replace the antiquated, outdoor AC chillers with protected, indoor equipment to save the Air Force potentially millions of dollars in parts and energy. (U.S. Air Force photo/Staff Sgt. Jonathan Steffen)
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