American military involvement refers to the engagement of the United States Armed Forces in conflicts and military operations abroad. This term is particularly significant in the context of the Vietnam War, where the U.S. aimed to contain the spread of communism and support the South Vietnamese government against the North Vietnamese forces and the Viet Cong. This period was marked by a large-scale deployment of troops, extensive use of air power, and significant domestic opposition, shaping public perception of U.S. foreign policy.