U.S. Army soldiers from Stryker Brigade Combat Team run into an Infantry Carrier Vehicle in a live fire drill during joint exercises with South Korea, dubbed Key Resolve and Foal Eagle, at Seungjin Fire Training Field in Pocheon, South Korea, Monday, March 7, 2011. South Korean and U.S. troops kicked off their annual drills Feb. 28, while North Korea slammed the maneuvers as a rehearsal for invasion that could trigger a nuclear war on the divided peninsula.(AP Photo/Ahn Young-joon)