Travis tankers refuel Nightwatch
An E-4B from U.S. Air Force Global Strike Command, Barksdale Air Force Base, La., flies below a KC-10 Extender from Travis Air Force Base, Calif., during a local mission June 12, 2017. To provide direct support to the President, the Secretary of Defense, and the JCS, at least one E-4B National Airborne Operations Center is always on 24-hour alert, 7-days a week, with a global watch team at one of many selected bases throughout the world. (U.S. Air Force photo/Staff Sgt. Nicole Leidholm/Released)

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Photo by: Staff Sgt. Nicole Leidholm |  VIRIN: 170612-F-BH656-218.JPG