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Posts are driven into the ground by a crew installing a new solar array at Hill Air Force Base, Utah, Dec. 14, 2018. The new system will generate 17 times more power than the base's first array installed in 2008. (U.S. Air Force photo by R. Nial Bradshaw)

Photo by: r. nial bradshaw |  VIRIN: 181214-F-OD616-0003.JPG