Mattis Remarks Defense Secretary Jim Mattis speaks during a news conference with Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, at the Pentagon, May 19, 2017. Mattis and Dunford updated reporters on the fight against the Islamic State of Iraq and Syria. DoD photo by Army Sgt. Amber I. Smith SHARE: Download: Full Size (1.17 MB) Credit: Amber I. Smith VIRIN: 170519-D-SV709-137.JPG Photo Gallery