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: Download: Full Size (0.38 MB) Tags: marines, aspen security forum, cjcs, joe dunford, marine corps Credit: Sgt. James K. McCann VIRIN: 170722-D-SW162-1222.JPG Photo Gallery