Smoke bombs explode near South Korean army K1 tanks during an annual South Korea-U.S. joint military drill, known as the Key Resolve exercise at Seungjin Fire Training Field in Pocheon, south of the demilitarized zone (DMZ) that separates the two Koreas since the Korean War, Thursday, March 8, 2012. (AP Photo/Yonhap, Lim Byung-shick) KOREA OUT