Vietnam
The Vietnam War began due to a division between communist North Vietnam and capitalist South Vietnam, with the Viet Cong rebels seeking to overthrow the south. During the Cold War, the U.S. supported the south and became heavily involved after war broke out in 1955. As the conflict escalated and casualties mounted, American public opposition grew, leading President Nixon to withdraw U.S. troops by 1973. After the American withdrawal, the North Vietnamese Army eventually defeated the unprotected south. The U.S. military used various weapons during the war, including the Colt M1911 and the M16, though early models of the M16 experienced serious malfunctions that led to fatalities, thes flaws were fixed by 1968.