CJCS at Aspen Security Forum Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, speaks about strategy in a volatile world with Andrea Mitchell, NBC News Chief Foreign Affairs Correspondent, at the Aspen Security Forum in Aspen, Colo., July 22, 2017. DoD photo by Army Sgt. James K. McCann SHARE IMAGE: Download Image: Full Size (0.28 MB) Photo By: Sgt. James K. McCann VIRIN: 170722-D-SW162-1104.JPG Photo Gallery