The United States begun training Syrian forces to fight ISIS militants, Defense Secretary Ashton Carter said Thursday. Carter said that about 90 Syrian fighters had begun their training, and he said a second group would begin training in the next weeks. He called it "critical and a complex part" of U.S. efforts to fight ISIS. Carter declined to say where they were being trained. He said that the rebels were being trained only to fight ISIS and were not being asked by the United States to fight the forces of President Bashar Assad in the Syrian civil war.