The top US military officer made an unannounced visit to a U.S base in Syria on Saturday to assess a nearly eight-year-old mission there to combat Islamic State and to review safeguards for US troops against attack.
Army General Mark Milley, chairman of the Joint Chiefs of Staff, told reporters traveling with him that he believed US troops and their Kurdish-led Syrian partners were making progress at ensuring a lasting defeat of the Islamic State group.
Asked if he believed the Syria mission was worth the risk, Milley tied it to the security of the United States and its allies, saying: "If you think that that's important, then the answer is 'Yes.'"