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Westmoreland is most notable for commanding the Vietnam War. He served as the commander of the United States Military Assistance Command, Vietnam (MACV) from 1964 to 1968. During his tenure, he oversaw the escalation of American involvement in the war, including the deployment of over 500,000 troops. Westmoreland's leadership and strategy were controversial, and he was criticized for his optimistic assessments of the war's progress.