171003-D-SW162-1068 Sen. John S. McCain greets Defense Secretary James N. Mattis and Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, before a Senate Armed Services Committee hearing on Capitol Hill, Oct. 3, 2017. Mattis and Dunford testified about the political and security situation in Afghanistan. SHARE IMAGE: Download Image: Full Size (1.25 MB) Photo By: Sgt. James K. McCann VIRIN: 171003-D-SW162-1068.JPG Photo Gallery