Staff Sgt. Josh Jenkins, 22nd Maintenance Squadron hydraulics specialist, checks the oil on a KC-135 Stratotanker engine during Red Flag-Alaska 17-2, June 22, 2017, at Eielson Air Force Base, Alaska. The exercise demanded aircraft to operate reliably at an increased rate, flying more than three times as often as usual. (U.S. Air Force photo/Senior Airman Chris Thornbury)
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