Distinguished Service Defense Secretary Ash Carter, left, awards former U.S. Sen. John Warner of Virginia the Department of Defense Medal for Distinguished Public Service during a ceremony at the Pentagon, Sept. 21, 2016. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley SHARE: Download: Full Size (1.54 MB) Credit: Brigitte N. Brantley VIRIN: 160921-D-GO396-359C.JPG Photo Gallery