U.S. Defense Secretary James Mattis speaks during a press briefing with U.S. Chairman of the Joint Chiefs of Staff Joseph Dunford (not in the picture) at the Pentagon, the United States on Aug. 28, 2018. The United States and Turkey plan to conduct combined patrols in northern Syria to enhance security there, U.S. Chairman of the Joint Chiefs of Staff Joseph Dunford said on Tuesday. (Xinhua/Ting Shen)
