CJCS at Aspen Security Forum Moderator Andrea Mitchell, NBC News chief foreign affairs correspondent, thanks Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, as the 2017 Aspen Security Forum ends in Aspen, Colo., July 22, 2017. DoD photo by Army Sgt. James K. McCann SHARE IMAGE: Download Image: Full Size (0.38 MB) Tags: Aspen Security Forum, CJCS, Joe Dunford, MARINE CORPS, MARINES Photo By: Sgt. James K. McCann VIRIN: 170722-D-SW162-1222.JPG Photo Gallery