I Corps Tactical Zone
| I Corps | |
|---|---|
| Active | 1960s–1975 |
| Country |
 South Vietnam
|
| Branch |
 ARVN
|
| Type | Corps |
| Garrison/HQ |
Quảng Trị Province Thừa Thiên-Huế Province Quảng Nam Province Quảng Tín Province Quảng Ngãi Province |
| Engagements | |
| Commanders | |
| Notable commanders |
Hoàng Xuân Lãm Ngô Quang Trưởng |
| Insignia | |
| Division flag |  |
The I Corps Tactical Zone (Vietnamese: Vùng 1 Chiến thuật) was a corps of the Army of the Republic of Vietnam (ARVN), the army of the nation state of South Vietnam that existed from 1955 to 1975. It was one of four corps of the ARVN. This was the northernmost region of South Vietnam, bordering North Vietnam. These five provinces are Quảng Trị Province, (Khe Sanh, Đông Hà, Quảng Trị City), Thừa Thiên-Huế Province, (Phu Bai, Huế City), Quảng Nam Province, (Đà Nẵng, Hội An), Quảng Tín Province, (Tam Kỳ, Chu Lai) and Quảng Ngãi Province, (Quảng Ngãi). The region included the DMZ area where 3rd Marine Division intelligence estimated the combat strength of NVA and VC forces in January 1968 was 40,943 troops.
Among its formations and units were the 1st Division. The I CTZ, later Military Region 1, was partnered with the U.S. III Marine Expeditionary Force and the XXIV Corps.
General Hoàng Xuân Lãm (Hoàng Xuân Lãm) was given responsibility for the I Corps Tactical Zone in 1967. He coordinated the South Vietnamese Operation Lam Sơn 719 offensive which aimed at striking the North Vietnamese logistical corridor known as the Ho Chi Minh trail in southeastern Laos during 1971. Due to his political connections with President Nguyễn Văn Thiệu, he was still serving as I Corps commander when the North Vietnamese launched the Nguyên Huế Offensive (called the Easter Offensive) in 1972. Lãm was recalled to Saigon on 2 May 1972 by Thiệu, who relieved him of his command, due to complaints regarding Lãm's fitness and competency as a general. He was succeeded as commander by Ngô Quang Trưởng.
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