The commander of the U.S. nuclear force ignited controversy when he said Saturday that he would not follow an illegal order from the president. U.S. Strategic Command commander Air Force Gen. John Hyten was asked during the Halifax International Security Forum in Nova Scotia what he would do if he was asked to do something that was illegal. Hyten responded that military officers study the law of armed conflict, which has certain principles they must abide by. “If you execute an unlawful order, you can go to jail, and you could go to jail for the rest of your life,”...