Chairman of the Joint Chiefs of Staff Marine Corps Gen. Joe Dunford (center), then commander of the International Security Assistance Force in Afghanistan, and then Army Lt. Gen. Mark Milley (right), render honors during a change of command ceremony at Kabul International Airport, Afghanistan, May 2, 2013. In a tweet Dec. 8, 2018, President Donald J. Trump indicated he will nominate Milley as the next chairman. Milley, now a four-star general, is the Army chief of staff. Army photo by Staff Sgt. Daniel Wallace