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Mark Alexander Milley (born June 20, 1958) is a retired United States Army general who last served as the 20th chairman of the Joint Chiefs of Staff from October 1, 2019, to September 30, 2023. He previously served as the 39th chief of staff of the Army from August 14, 2015, to August 9, 2019, and held multiple command and staff positions in eight divisions and special forces throughout his military career. Wikipedia