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Crews work on installing the rack system for a new solar array at Hill Air Force Base, Utah, Dec. 12, 2018. The fixed 25-degree angle of the system will provide maximum production to the base during peak electrical consumption periods. (U.S. Air Force photo by R. Nial Bradshaw)

Photo by: r. nial bradshaw |  VIRIN: 181214-F-OD616-0002.JPG