An interceptor failed to destroy a dummy warhead early this morning during a test of the Pentagon's multibillion-dollar National Missile Defense system high over the Pacific Ocean because of a communications problem between the rocket booster and kill vehicle. The test was the third intercept attempt for the controversial NMD program and the last before Defense Secretary William Cohen is slated to recommend to President Clinton whether to go forward with an NMD deployment plan. A modified Minuteman missile carrying...