Mattis Remarks Defense Secretary James N. Mattis and Marine Corps Gen. Joe Dunford, the chairman of the Joint Chiefs of Staff, update reporters on the effort to defeat of the Islamic State of Iraq and Syria during a joint news conference at the Pentagon, May 19, 2017. DoD photo by Army Sgt. Amber I. Smith SHARE IMAGE: Download Image: Full Size (1.17 MB) Tags: Briefings, JIm Mattis, SecDef, Inherent Resolve, Chairman, Joint Chiefs, Joe Dunford, MARINE CORPS, MARINES Photo By: Amber I. Smith VIRIN: 170519-D-SV709-137.JPG Photo Gallery