U.S. Army soldiers drive armored vehicles during annual military drills in Yeoncheon, South Korea, near the border with North Korea, Tuesday, April 9, 2013. North Korea has unleashed a flurry of war ... more 
U.S. Army soldiers drive armored vehicles during annual military drills in Yeoncheon, South Korea, near the border with North Korea, Tuesday, April 9, 2013. North Korea has unleashed a flurry of war threats and provocations over U.N. sanctions for its last nuclear test, and over the ongoing U.S.-South Korean military drills, which the allies say are routine but Pyongyang says is a preparation for a northward invasion. (AP Photo/Ahn Young-joon) less 
1 / 30
Associated Press | Photo By Ahn Young-joon
Tue, Apr 9, 2013 6:17 AM EDT