Pentagon Briefing Defense Secretary Dr. Mark T. Esper and Army Gen. Mark A. Milley, chairman of the Joint Chiefs of Staff, speak to reporters at the Pentagon, Dec. 20, 2019. SHARE IMAGE: Download Image: Full Size (0.83 MB) Tags: Milley, Chairman, Defense Secretary, Esper Photo By: Marine Corps Sgt Warren Smith, DOD VIRIN: 191220-D-MG926-022.JPG Photo Gallery