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U.S. Air Force boom operator, Master Sgt. Yale Perkins goes over his pre-flight checklist on a KC-135 Stratotanker prior to a refueling mission over Afghanistan, May 3, 2010. Sergeant Perkins is assigned to the 340th Expeditionary Air Refueling Squadron. (U.S. Air Force photo/Staff Sgt Quinton Russ/released)
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