UPDATE 1-Pentagon chief says U.S. keeping eye on North Korea's missile program
February 03, 2016 at 22:37 PM EST
MARINE CORPS AIR STATION MIRAMAR, Calif., Feb 3 (Reuters) - U .S. Defense Secretary Ash Carter said on Wednesday the U.S. military was keeping a vigilant eye on North Korea's missile and nuclear programs, and was continually expanding its defenses against a possible missile attack by Pyongyang.