U.S. Defense Secretary Robert Gates says he has ordered the deployment of a new missile defense system and a sophisticated tracking radar to respond to any North Korean missile launch that threatens Hawaii. Meanwhile, America's top military officer says the U.S. Navy is prepared to try to stop North Korean ships suspected of carrying weapons banned by a new United Nations Security Council resolution. Secretary Gates says the United States is watching North Korea's missile launch preparations "very closely" and he has ordered a new high-altitude missile interceptor system deployed to Hawaii, along with a floating radar system to provide...