Lawmakers want an independent assessment of a proposal to arm Predator unmanned aircraft with guided missiles to shoot down North Korean intercontinental ballistic missiles, leveraging proven technologies in the American arsenal to rapidly field a system that uses kinetic interceptors to kill Pyongyang's ballistic missiles during the boost phase of flight. The House Armed Services Committee chairman's mark of the FY-19 defense authorization bill will include a provision requiring the Defense Secretary to commission a federally funded research and development...