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Staff Sgt. Rachel Crofoot, 141st Aircraft Maintenance Squadron crew chief, works on a KC-135 Stratotanker during an Isochronal Inspection July 26, 2017, at Fairchild Air Force Base, Washington. The Air Force wants to keep the KC-135 Stratotanker in the air for many years to come. The efforts made by the ISO is what makes this possible, because of them the KC-135 will see the year 2040. (U.S. Air Force photo/Senior Airman Sean Campbell)
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