I Corps tactical zone
During the Vietnam War, the Army of the Republic of Viet Nam (ARVN) defined I Corps tactical zone (I CTZ) as the five northernmost provinces of South Vietnam: from approximate north to south, these were
|1965 name||Capital||Current name|
|Quang Tri||Dong Ha||Quang Tri|
|Thua Thien||Hue||Hue Province|
|Quang Nam Province||Tam Ky||Quang Nam Province|
|Quang Tri Province||Dong Ha||Quang Tri Province|
|Quang Ngai Province||Quang Ngai||Quang Ngai Province|
North Vietnamese equivalents
These areas came under Military Regions 4 and 5, as well as the B-5 Front.
American forces in I Corps began with III Marine Amphibious Force, its name changed from the usual designation of III Marine Expeditionary Force due to "expeditionary force" having unfortunate connotations, to the Vietnamese, from French usage. Later in the war, the Military Assistance Command, Vietnam, asserted more control over the Marines, variously putting a forward echelon of MACV there, and establishing TASK FORCE OREGON and Provisional Corps, Vietnam.
In 1972, Hoang Xuan Lam was dismissed for incompetence.
- Corps is usually a tactical, rather than geographical structure; the U.S. renamed its Vietnam War corps formation s "field forces" to avoid confusion. In July 1970, the Republic of Vietnam redesignated its CTZs as Military Regions (MR). ARVN MR numbers, however, had no relationship to the People's Army of Viet Nam's MR numbering scheme.
- Pearson, Willard (1975), Vietnam Studies : The War in the Northern Provinces, Office of the Chief of Military History, U.S. Army