Travis tankers refuel Nightwatch
An E-4B from U.S. Air Force Global Strike Command, Barksdale Air Force Base, La., is refueled by a KC-10 Extender from Travis Air Force Base, Calif., during a local mission June 12, 2017. In case of national emergency or destruction of ground command and control centers, the E-4B provides a highly survivable command, control and communications center to direct U.S. forces, execute emergency war orders and coordinate actions by civil authorities. (U.S. Air Force photo/Staff Sgt. Nicole Leidholm/Released)

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Photo by: Staff Sgt. Nicole Leidholm |  VIRIN: 170612-F-BH656-155.JPG