Brief Reporters Defense Secretary James N. Mattis and Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, brief reporters on U.S. military strategy and current operations, Aug. 28, 2018. DoD photo by Jim Garamone SHARE IMAGE: Download Image: Full Size (0.42 MB) Tags: Marine Corps Gen. Joe Dunford , Defense Secretary James N. Mattis Photo By: Jim Garamone VIRIN: 180828-D-FN314-001A.JPG Photo Gallery