US and Britain. Beginning in 2001, South Korea had so far deployed 24,000 troops in the Middle East region to support the War on Terrorism. A further 1,800 were deployed since 2007 to reinforce UN peacekeeping forces in Lebanon. United States contingent The United States has stationed a substantial contingent of troops to defend South Korea. There are approximately 28,500 U.S. military personnel stationed in South Korea, most of them serving one year unaccompanied tours. The U.S. troops, which are primarily ground and air units, are assigned to USFK and mainly assigned to the Eighth United States Army of the U.S. Army and Seventh Air Force of the U.S. Air Force. They are stationed in installations at Osan, Kunsan, Yongsan, Dongducheon, Sungbuk, Camp Humphreys, and Daegu, as well as at Camp Bonifas in the DMZ Joint Security Area. A fully functioning UN Command is at the top of the chain of command of all forces in South Korea, including the U.S. forces and the entire South Korean military – if a sudden escalation of war between North and South Korea were to occur the United States would assume control of the South Korean armed forces in all military and paramilitary moves. There has been long-term agreement between the United States and South Korea that South Korea should eventually assume the lead for its own defense. This transition to a South Korean command has been slow and often postponed, although it is currently scheduled to occur in the early 2020s. Conscientious objection Male citizens who refuse or reject to undertake military services because of conscientious objection are typically imprisoned, with over 600 individuals usually imprisoned at any given time; more than the rest of the world put together. The vast majority of these are young men from the Jehovah's Witnesses Christian denomination. However, in a court ruling of 2018, conscientious objectors were permitted to reject military service. Economy South Korea's mixed economy ranks 10th nominal and 13th purchasing power parity GDP in the world, identifying it as one of the G-20 major economies. It is a developed country with a high-income economy and is the most industrialized member country of the OECD. South Korean brands such as LG Electronics and Samsung are internationally famous and garnered South Korea's reputation for its quality electronics and other manufactured goods. Its massive investment in education has taken the country from mass illiteracy to a