United States Use
In the United States, during the Vietnam War the term came to stand for a Corps-sized organization with other functions and responsibilities. To avoid confusion with the Corps designations used by the Army of the Republic of Vietnam and to allow for a flexible organization, MACV and General William Westmoreland developed the "Field Force" such as I Field Force and II Field Force. Unlike an Army Corps, which had a size and structure fixed by Army doctrine, the Field Force could expand as needed and had other functions such as liaison with South Vietnamese and Civil Affairs functions and was flexible enough to have many subordinate units assigned to it.
Read more about this topic: Field Force
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