Christopher Arnold, 319th Medical Group facility manager, stands in a mechanical room that had been renovated with brand new energy and heating, ventilating and air conditioning equipment Jan. 27, 2016, on Grand Forks Air Force Base, North Dakota. The goal of the 319th MDG is to be more energy efficient and to provide a more comfortable environment for staff and patients. (U.S. Air Force photo by Senior Airman Xavier Navarro/Released)
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