Swearing In Ceremony Marine Corps Gen. Joe Dunford, right, outgoing chairman of the Joint Chiefs of Staff, swears in Army Gen. Mark A. Milley as the 20th chairman of the Joint Chiefs of Staff, during a ceremony at Joint Base Myer–Henderson Hall, Va., Sept. 30, 2019. SHARE IMAGE: Download Image: Full Size (1.28 MB) Tags: Milley, Chairman, Dunford Photo By: DOD photo by U.S. Army Sgt. James K. McCann VIRIN: 190930-D-SW162-2226.JPG Photo Gallery