The self-proclaimed Islamic State broke through a line of Kurdish forces in Iraq and killed a U.S. service member Tuesday who were there to advise them, a U.S. defense official told the Daily Beast. U.S. advisers had arrived on Monday morning to assist the Kurdish forces, known as peshmerga, in the northern city of Mosul, checking on “their morale and defenses,” the official said. The U.S. forces were as many as 3 miles from the frontlines when the ISIS fighters attacked, the official said. ISIS fighters “appeared to penetrate the forward line” and began attacking the peshmerga. A U.S. service...