The chairman of the Joint Chiefs of Staff on Tuesday said it’s possible that American troops could be called into battle against the Islamic State in Iraq and Syria (ISIS).

President Obama has deployed 1,600 U.S. advisers to Iraq so far, but has stressed that troops are not “boots on the ground” in a combat role.

But Gen. Martin Dempsey said Obama has ordered him to come back “on a case-by-case basis” if the use of ground forces needs to be reconsidered. […]