A South Korean worker loads U.S. Army M1A1 battle tanks and an M2A2 Bradley fighting vehicle (L) of 11th Armor Cavalry Regiment from the National Training Center at Fort Irwin, California, onto trains during a U.S. Army Preposition Stocks-4 drill at Camp Carroll in Chilgok, about 290 km (180 miles) southeast of Seoul, March 3, 2011. The drill is part of the annual Key Resolve/Foal Eagle military exercises by the U.S. and South Korea, which is scheduled from February 28 to March 10 across the South. The soldiers and vehicles will move to a shooting range near the demilitarised zone separating the two Koreas to participate in the annual exercise. REUTERS/Jo Yong-Hak (SOUTH KOREA - Tags: POLITICS MILITARY)