Patrolling the perimeter
Senior Airman David Gill, 9th Security Forces Squadron base defense operation controller, drives an all-terrain vehicle on the outskirts of Beale Air Force Base, California, Nov. 4, 2016. On the patrols personnel check for intruders and damage to the installation perimeter. (U.S. Air Force photo/Airman Tristan D. Viglianco)

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Photo by: Airman Tristan D. Viglianco |  VIRIN: 161104-F-ZH169-413.JPG