Travis tankers refuel Nightwatch
An E-4B from U.S. Air Force Global Strike Command, Barksdale Air Force Base, La., sits on the ramp at Travis Air Force Base, Calif., June 9, 2017. The E-4B serves as the National Airborne Operations Center and is a key component of the National Military Command System for the President, the Secretary of Defense and the Joint Chiefs of Staff. (U.S. Air Force photo/Staff Sgt. Nicole Leidholm/Released)

Download Image: Full Size (1.68 MB)
Photo by: Staff Sgt. Nicole Leidholm |  VIRIN: 170612-F-BH656-006.JPG