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| Third Republic of Korea Army | |
|---|---|
| Unit name | Third Republic of Korea Army |
| Native name | 제3군 |
| Caption | Flag of the Republic of Korea Army |
| Dates | 1963–present |
| Country | South Korea |
| Branch | Republic of Korea Army |
| Type | Field army |
| Role | Defense of southeastern peninsula |
| Size | Corps-level formations |
| Command structure | Republic of Korea Army |
| Garrison | Daegu |
| Nickname | 3rd Army |
| Battles | Vietnam War, Korean DMZ incidents, Cold War posture |
| Motto | 국토수호 |
| Colors | Blue and white |
| Commander1 label | Commander |
Third Republic of Korea Army is a major field army formation of the Republic of Korea Army responsible for defense and operational command in the southeastern Korean Peninsula. Established during the Cold War era, the formation has overseen corps-sized units, territorial defense, and expeditionary contributions to regional conflicts. It has interacted with international partners such as the United States Army and participated in cooperative exercises like Team Spirit (exercise) and Ulchi-Freedom Guardian.
The formation traces its roots to post-Korean War reorganization under the Republic of Korea Armed Forces modernization programs of the 1950s and 1960s influenced by advisors from the United States Department of Defense and the United States Army Forces Far East. During the Cold War (1947–1991), the formation maintained a forward defensive posture against the Korean People's Army and handled incidents along the Korean Demilitarized Zone and the Northern Limit Line. In the 1960s and 1970s it operated alongside units engaged in the Vietnam War where elements from the Republic of Korea Armed Forces served under United States Military Assistance Command, Vietnam agreements, cooperating with formations like the XXIV Corps (United States Army) and allied contingents from the Australian Army and New Zealand Defence Force. The formation adapted through reforms linked to the Yushin Regime era defense policies and later to the Defense Reform 2020 initiatives promulgated by the Ministry of National Defense (South Korea) and presidents such as Park Chung-hee and Roh Moo-hyun. Post-1990s restructuring responded to incidents like the Korean axe murder incident and the Battle of Yeonpyeong (1999) as part of broader peninsula security adjustments.
Organizationally, the formation supervises subordinate corps and divisions including combined-arms divisions and artillery brigades, modeled on structures advised by United States Army Pacific and doctrinal exchanges with NATO partners. Its headquarters in Daegu coordinates logistics with depots in Busan and training ranges near Miryang and Gyeongsan. Corps under its command have included formations aligned with the I Corps (South Korea) and II Corps (South Korea) framework during different periods, and cooperation with the Republic of Korea Marine Corps and Republic of Korea Air Force air support wings. Administrative control involves liaison with the Joint Chiefs of Staff (South Korea) and regional civil authorities in North Gyeongsang Province and South Gyeongsang Province.
The formation fields equipment procured through programs involving the Agency for Defense Development (South Korea), domestic industries like Hyundai Rotem and Korean Aerospace Industries, and imports from the United States. Armored units have employed K2 Black Panther prototypes in trials, as well as K1 88-Tank variants and captured-era legacy systems updated by Hanwha Defense. Artillery brigades transitioned from towed systems to self-propelled platforms such as the K9 Thunder and rocket artillery like the K239 Chunmoo. Air-defense assets incorporated systems interoperable with Patriot batteries supplied by the United States Army Air Defense Artillery Branch and domestic systems developed with Defense Acquisition Program Administration. Small arms and anti-armor inventories include variants of the Daewoo K2 rifle and anti-tank guided missiles from Lockheed Martin and domestic firms.
The formation provided rear-area security and mobilization staging for ROK contingents deployed to the Vietnam War and supported counterinsurgency logistics with the United States Marine Corps and United States Army Special Forces. It responded to multiple DMZ Conflict (1966–1969) incidents and coordinated with multinational observers in Neutral Nations Supervisory Commission frameworks. During crises such as the Korean Air Lines Flight 007 aftermath and maritime skirmishes near the Yellow Sea it executed crisis mobilization plans with allied command elements from United States Forces Korea and conducted joint exercises with the Japan Ground Self-Defense Force and People's Liberation Army monitoring. It also played roles in humanitarian assistance after disasters like the Sampoong Department Store collapse and interagency relief coordinated with the National Emergency Management Agency (South Korea).
Doctrine evolved from combined-arms concepts introduced by United States Army Training and Doctrine Command (TRADOC) advisors and later refined by the Republic of Korea Army Training & Doctrine Command (TRADOC). Training cycles used ranges such as Hwaseong Maneuver Area and incorporated live-fire exercises with multinational observers from United Kingdom Armed Forces and Canadian Army delegations. Professional military education involved institutions like the Korea Military Academy, R.O.K. Army Command and Staff College, and international staff courses at the United States Army War College. Counter-infiltration, mountain warfare, and amphibious coordination doctrines drew on lessons from engagements with the Korean People's Navy incidents and studies of the Battle of Chosin Reservoir and other Cold War-era battles.
Commanders have interfaced with chiefs from the Joint Chiefs of Staff (South Korea) and testified before the National Assembly of South Korea defense committees. Senior leaders engaged in bilateral talks with commanders from United States Forces Korea and participated in trilateral security dialogues with officials from the Ministry of Foreign Affairs (South Korea) and allies. Leadership development emphasized exchange postings with the United States Army Pacific and attendance at courses in institutions like the NATO Defence College and the Asia-Pacific Center for Security Studies.
The formation influenced mechanization and professionalization trends in the Republic of Korea Army and contributed to export-oriented defense industry growth led by firms such as Hyundai Heavy Industries and LIG Nex1. Its operational lessons informed national policies like Defense Reform 307 and shaped alliance interoperability standards with United States Forces Korea and partners in ANZUS-aligned practices. The command’s evolution paralleled South Korea’s transition from conscription-heavy forces to technologically advanced units, impacting institutions such as the Korea Institute for Defense Analyses and curricula at the Sejong Institute.