Obama Reminds North Korea of U.S. "Military Might"
Description:A raucous welcome for President Barack Obama on the last stop of his South Korea trip. Obama was greeted by U.S. troops at the Yongsan garrison and a sea of mobile phones. The U.S. president's week long Asia tour comes as North Korea sends out new signals it's preparing for a fourth nuclear test. But Obama warned that the U.S. would respond to any "provocations" by Pyongyang.(1:55)