Chairman's Ceremony President Donald J. Trump shakes hands with Army Gen. Mark A. Milley upon the latter’s assumption of office 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 (0.4 MB) Tags: Milley, Chairman, Trump, president Photo By: White House VIRIN: 190930-O-ZZ999-223.JPG Photo Gallery