U.S. Air Force pilots, Major Dusty Benker and First Lieutenant Nate Preston of the161st Operations Group, perform 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)