A South Korean Army's K-1 tank releases smoke bombs to hide itself during the U.S.-South Korea joint military exercise against possible attacks by North Korea, at a shooting range near the demilitarized zone separating the two Koreas in Paju, about 45 km (28 miles) north of Seoul, June 8, 2011. The two Koreas are technically still at war and station about 1 million troops near their respective sides of the demilitarized zone that has divided the peninsula since the 1950-53 Korean War ended in a ceasefire, but not a peace treaty. REUTERS