This Day in Military History

20 June 1964: General William Westmoreland was given command of U.S. Military Assistance Command Vietnam (MACV). His initial task was to provide military advice and assistance to the government of South Vietnam. But as U.S. ground troops were introduced, Westmoreland assumed the added responsibility of commanding them in combat. He would serve in that role until July 1968.

Brandus, Paul. This Day in U.S. Military History (pp. 152-153). Bernan Press. Kindle Edition.