U.S.-China Dialogue Defense Secretary Jim Mattis and Secretary of State Rex Tillerson address reporters following a U.S.-China diplomatic and security dialogue at the State Department in Washington, D.C., June 21, 2017. The dialogue is intended to broaden communication and cooperation between both countries. DoD photo by Army Sgt. Amber I. Smith SHARE: Download: Full Size (1.25 MB) Credit: Amber I. Smith VIRIN: 170621-D-SV709-200L.JPG Photo Gallery