Defense Secretary Jim Mattis said recently it would be "game on" if North Korea were to fire a missile at the United States or its allies, but how fast things would happen is not so clear. A leading expert in missile defense told Fox News there would not be much time to decide to shoot down a North Korean missile. “This is a game of minutes, but the initial detection of a launch would be really in terms of seconds,” said Thomas Karako, senior fellow and director of the Missile Defense Project at the Center for Strategic and International Studies....