In the United States there was a draft. Other involved nations may have had other mechanisms for choosing their conscripts.
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They were drafted.
No.
Vietnam and Cambodia
Great Britain did not send troops to Vietnam during the war.
The US asked them to.
The US Civil War (1861-1865) & the Vietnam War (1961-1975).
Nixon said that he would pull troops out of Vietnam. Under a plan called "peace with honor", Nixon planned to negotiate an end to the war.
He brought in more troops in Vietnam and many people knew that was no use
Thailand sent troops to South Vietnam.
He was only in the Korean War. He did entertain the troops in the Vietnam War.
roughly 60,000
Orders from the Commander in Chief.