Electrical infrastructure improvements: 75 years in the making
Contractors raise themselves up to work on an electrical substation at Beale Air Force Base, Calif. Oct. 23, 2017. An increased demand for power meant Beale needed to revamp the entire electrical grid. (U.S. Air Force photo/Airman 1st Class Tristan D. Viglianco)

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Photo by: Airman 1st Class Tristan D. Viglianco |  VIRIN: 171023-F-ZH169-1029.JPG