ROK 1st Division

ROK 1st Division
Unit name	ROK 1st Division
Native name	제1보병사단
Dates	1948–present
Country	Republic of Korea
Branch	Republic of Korea Army
Type	Infantry
Role	Frontline defense, combined-arms operations
Size	Division
Garrison	Incheon, Goyang, Seoul
Battles	Korean War, Battle of Pusan Perimeter, Battle of Inchon, Second Battle of Seoul, Operation Ripper
Notable commanders	Paik Sun-yup, Choe Kwang

ROK 1st Division is a major infantry formation of the Republic of Korea Army established in 1948 and active through the Korean War into the present. The division has been central to defenses of the Demilitarized Zone, participated in major engagements such as the Battle of Pusan Perimeter and Battle of Inchon, and has evolved alongside reforms driven by strategic relationships with the United States, United Nations Command, and regional security dynamics involving North Korea and China. Its lineage connects to prominent figures including Paik Sun-yup and institutional links with the ROK Army Special Warfare Command.

History

Formed in 1948 during the establishment of the Republic of Korea armed forces, the division assumed front-line duties amid tensions with North Korea and internal security challenges involving the Jeju Uprising and postwar stabilization. In 1950 it engaged in the Battle of Ongjin, was tested during the Invasion of South Korea, and played roles in the Battle of Pusan Perimeter, Incheon Landing, and the subsequent United Nations Command counteroffensives against the Korean People's Army. Throughout the Cold War it adjusted to doctrines influenced by United States Forces Korea, participated in exercises with Combined Forces Command and responded to crises such as the Blue House Raid aftermath and tensions during the Korean DMZ Conflict (1966–69). Post-Cold War reforms tied to the Defense Reform 2020 program and modern procurement with platforms from Hanwha Defense, Korea Aerospace Industries, and allied transfers reconfigured its force posture along the Military Demarcation Line and within Capital Defense Command frameworks.

Organization and structure

The division is organized into maneuver, fires, reconnaissance, engineering, logistics, and support elements, integrating brigades and battalions familiar from ROK Army force tables. Typical subordinate units include infantry brigades, an armored battalion equipped from K1 MBT and K200 APC families, an artillery regiment with systems such as the K9 Thunder and towed howitzers, an aviation liaison linking to Republic of Korea Army Aviation Command, and signals units interoperable with Combined Forces Command (CFC). Its headquarters coordinates with I Corps (ROK) and regional commands like V Corps (ROK) for operational planning and with National Security Council (South Korea) for strategic direction. Liaison relationships exist with United States Forces Korea, United Nations Command Military Armistice Commission, and local civil organizations including Seoul Metropolitan Government for civil-military cooperation.

Equipment and capabilities

Equipment portfolios reflect indigenous and allied systems: main battle tanks from Hyundai Rotem designs and legacy M48 Patton derivatives, infantry fighting vehicles and armored personnel carriers from Doosan DST and Hanwha Defense, indirect fires using K9 Thunder self-propelled artillery and KH179 towed howitzers, and anti-armor guided missiles of types co-developed with Raytheon and Hanwha. Air defense capabilities include systems interoperable with Korea Air and Missile Defense architectures and coordination with Republic of Korea Air Force assets such as F-15K Slam Eagle and KF-16 Fighting Falcon. Communications, electronic warfare, and battlefield management systems integrate technologies from Agency for Defense Development programs and allied protocols from NATO-aligned partners. Logistics chains rely on national firms like Hyundai Heavy Industries and regional ports including Incheon Port.

Combat operations and deployments

Combat history centers on the Korean War: defense during the Pusan Perimeter, participation in Operation Chromite supporting the Inchon Landing, and subsequent campaigns northward against the People's Volunteer Army during periods of Chinese intervention in the Korean War. In peacetime the division has been mobilized for counter-infiltration operations along the Demilitarized Zone and responses to incidents such as the EC-121 shootdown era tensions and provocations like the Korean axe murder incident. It has taken part in multinational exercises including Team Spirit, Ulchi-Freedom Guardian, and bilateral drills with United States Army units, contributing personnel to overseas deployments under United Nations Command contingents and humanitarian missions coordinated with United Nations agencies during regional crises.

Training and doctrine

Training regimes emphasize combined-arms maneuvers, counter-battery tactics, urban operations for scenarios in Seoul, and interoperability with United States Forces Korea and multinational partners. The division conducts live-fire exercises on ranges such as Gunsan Training Area and integrates doctrinal guidance from the ROK Army Doctrine publication series and allied concepts like AirLand Battle-derived approaches adapted to the Korean theater. Specialized schools including the ROK Army Infantry School and exchanges with the United States Army War College inform officer professional development, while noncommissioned officer cadres receive training aligned with Defense Reform 2.0 modernization goals and lessons from incidents like the DMZ clashes of 2010s.

Commanders and notable personnel

Commanders and senior officers associated with the division include prominent leaders such as Paik Sun-yup and Choe Kwang, whose careers intersected with national military leadership and postwar institution-building. Other notable personnel have gone on to roles within the Ministry of National Defense (South Korea), diplomatic posts in Ministry of Foreign Affairs (South Korea), and leadership positions in defense industries such as Hanwha Corporation and Korea Aerospace Industries. The division's alumni network includes recipients of national honors like the Taeguk Order of Military Merit and participants in trilateral staff talks with counterparts from United States Department of Defense and Japanese Ground Self-Defense Force delegations.

Category:Infantry divisions of South Korea