<br/><br/> South Korea and the United States today started their annual joint military exercises called Key Resolve and Foal Eagle. The Key Resolve exercise is aimed at rehearsing the defense of South Korea in case of emergencies, and Foal Eagle, counter- infiltration exercises, is focused on improving combined and joint operational posture between the two militaries. Local media report said about 10,000 U.S. troops and 8,000 reinforcement personnel will be participating for the Key Resolve exercise, and 20,000 South Korean troops will be involved in the Foal Eagle. The exercises are scheduled to end on March 18.