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.

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.