Secretary of the Army John M. McHugh administers the oath of office to 39th Chief of Staff of the Army Mark A. Milley during the United States Army change of responsibility ceremony held at Summerall Field on Fort Myer, Va., Aug. 14, 2015. Gen. Raymond T. Odierno relinquished command of the Army to Milley during the ceremony hosted by McHugh. (DoD photo by Army Staff Sgt. Sean K. Harp/Released)

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Keywords: army, ceremony, change, cjcs, csa, field, milley, odierno, responsibility, retirement, secdef, secretary, summer, swear