Preparing to Refuel
U.S. Air Force Staff Sgt. Johnny Estrada, 161st Operations Group boom operator, performs checklist steps during an aerial refueling mission over the Pacific Ocean, August 18, 2010. The 161st Air Refueling Wing KC-135s refueled three Hawaii Air National Guard F-15s on their way to Nellis Air Force Base. (U.S. Air Force Photo by Senior Airman Nicole Enos)

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Photo by: Senior Airman Nicole Enos  |  VIRIN: 100818-F-2900E-122.JPG