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U.S. Air Force Staff Sgt. Rachel Cullen, a boom operator assigned to 447th Air Expeditionary Group, guides the boom of a KC-135 Stratotanker during a refueling mission over Syria, Dec. 1, 2017. A boom operator is an aircrew member aboard a refueling aircraft responsible for safely and effectively refueling other aircraft during flight. (U.S. Air Force photo by Staff Sgt. Paul Labbe)
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