Answer:
The Vietnam War had a significant impact on world peace, and it could be argued that it threatened global stability during the Cold War era. The conflict was part of a larger struggle between communism and democracy, with the Soviet Union and China supporting North Vietnam, while the United States and other Western countries supported South Vietnam.
The war led to widespread destruction and loss of life, and it also contributed to increased tensions between the superpowers during the Cold War. The use of chemical weapons and the bombing of civilian areas further exacerbated the humanitarian impact of the war.
Moreover, the protests against the Vietnam War were a significant factor in the anti-war movement and the counterculture of the 1960s and early 1970s. This sociopolitical upheaval ultimately led to political changes in the United States and around the world.
Given these factors, I would set the event of the Vietnam War on the doomsday clock at around 3 minutes to midnight. While the conflict did not result in a full-blown global war or nuclear exchange, it represented a significant threat to world peace and security at the time.