The 2nd Infantry Division ("Indianhead") is a formation of the United States Army. Since the 1960s, its current primary mission is the pre-emptive defense of South Korea in the event of an invasion from North Korea. There are approximately 17,000 soldiers in the 2nd Infantry Division, with 10,000 of them stationed in South Korea, accounting for about 35% of the United States Forces Korea personnel. Denoted the 2nd Infantry Division-ROK/U.S. Combined Division (2ID/RUCD), the division is augmented by rotational Brigade Combat Teams (BCTs) from other U.S. Army divisions.

The Korean War was fought between North Korea and South Korea from 1950 to 1953. It began on 25 June 1950 when North Korea invaded South Korea and ceased after an armistice on 27 July 1953. North Korea was supported by China and the Soviet Union while South Korea was supported by the United States and US-led United Nations (UN) forces.