Electrical infrastructure improvements: 75 years in the making
Contractors work on electrical substation renovations at Beale Air Force Base, Calif. Oct. 23, 2017. Beale is upgrading five substations and building a new substation to meet the growing energy demands. (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-ZH169-011.JPG