Air Force second lieutenants celebrate during their graduation ceremony at the Air Force Academy in Colorado Springs, Colo., May 24, 2017. Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, delivered the commencement address. Air Force photo by Tech. Sgt. Julius Delos Reyes

Air Force second lieutenants celebrate during their graduation ceremony at the Air Force Academy in Colorado Springs, Colo., May 24, 2017. Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, delivered the commencement address. Air Force photo by Tech. Sgt. Julius Delos Reyes

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