Army Gen. Mark Milley (second from left), chairman of the Joint Chiefs of Staff, and others listen as President Trump speaks during a meeting with senior military leaders in October. Brendan Smialowski/AFP via Getty Images hide caption
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President Trump walking from the White House to St. John's Church on June 1. Gen. Mark Milley (far right), chairman of the Joint Chiefs of Staff, was among those walking behind the president. Milley says his presence was "a mistake" that he has learned from, but the incident has prompted discussions about how the military can maintain nonpartisanship within the Trump administration. Patrick Semansky/AP hide caption
President Trump has appointed Gen. Mark Milley to succeed Joint Chiefs Chairman Gen. Joseph Dunford. Andrew Harnik/AP hide caption