Shanahan said the withdrawal is in the early stages. "We're on a deliberate, coordinated, disciplined withdrawal," he said.
ISIS is no longer able to govern in Syria, he said. "ISIS no longer has freedom to amass forces. Syria is no longer a safe haven. We've eliminated a majority of their leadership. We've significantly diminished their financial capabilities," Shanahan said. "The way I would probably characterize the military operations conducted in Syria is that the risk of terrorism and mass migration has been significantly mitigated."
Inside Syria, he said, "99.5 percent plus" of territory controlled by ISIS just two years ago has been returned to the Syrians. "And within a couple of weeks, it'll be 100 percent," he added.
Along Syria’s northeastern border, some 3.5 million Syrian refugees are in Turkey, Shanahan said, and significant numbers of internally displaced people are on the Syrian side of the border. To ameliorate this crisis, he said, military-to-military conversations are happening, and the State Department is involved as well, looking for solutions. "There are very important dialogues going on in major capitals in Europe about support to that portion of Syria, as well as very important discussions with our [Syrian Democratic Forces] counterparts there in northeastern Syria," he added. "The discussions hold real promise."