President Donald Trump with, from left, Chief of Staff of the Army Gen. Mark Milley, Defense Secretary Jim Mattis, Trump, Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford and Marine Corps Commandant Gen. Robert Neller, listen to questions from the members of the media during a briefing with senior military leaders in the Cabinet Room at the White House in Washington, Tuesday, Oct. 23, 2018. (AP Photo/Manuel Balce Ceneta) WASHINGTON (AP) —U.S. officials say President Donald Trump will nominate the Army chief of staff, Gen. Mark Milley, as his next top military adviser. If confirmed by the Senate, Milley would succeed Marine Gen. Joseph Dunford to be chairman of the Joint Chiefs of Staff. Milley is a veteran of the Iraq and Afghanistan wars and has served as the Army’s top officer since August 2015. The officials confirmed the decision Friday on condition of anonymity because it had not been announced. Dunford, a former commandant of the Marine Corps, is expected to serve out his term as Joint Chiefs chairman, which ends next Oct. 1. Dunford originally was nominated for the Joint Chiefs position by former President Barack Obama, serving an initial two-year term. Trump re-nominated him in 2017 for a second term.