Patrolling the perimeter
Airman 1st Class Luis Valentin, 9th Security Forces Squadron installation entry controller, and Senior Airman David Gill, 9th SFS base defense operation controller pause during a coyote run Nov. 4, 2016, at Beale Air Force Base, California. Security forces' personnel patrol the perimeter of the base at least once per shift. (U.S. Air Force photo/Airman Tristan D. Viglianco)

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Photo by: Airman Tristan D. Viglianco |  VIRIN: 161104-F-ZH169-284.JPG