U.S. soldier from the 2nd Infantry Division wearing a gas mask and anti-chemical gear participates during a joint military drill between U.S. and South Korea for chemical, biological, radiological and nuclear detection and response capabilities at U.S. military base, Camp Casey in Dongducheon, north of Seoul, South Korea, Thursday, March 3, 2011. South Korean and U.S. troops kicked off their annual drills Monday, while North Korea slammed the maneuvers as a rehearsal for invasion that could trigger a nuclear war on the divided peninsula.
Lee Jin-Man Associated Press