51st Operations Group
The 51st Operations Group is the operational flying component of the United States Air Force's 51st Fighter Wing at Osan Air Base, South Korea.
Last updated August 31, 2026
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Overview
The 51st Operations Group is a United States Air Force operational unit assigned to the 51st Fighter Wing and based at Osan Air Base in the Republic of Korea. It provides combat-ready airpower for the defense of South Korea and is described by the Air Force as one of the most forward-deployed operational groups in the service. Its responsibilities include close air support, air interdiction, counter-air operations, air-strike control, theater airlift support, and operational communications. The organization traces its lineage to the 51st Pursuit Group, activated in January 1941 during the military buildup preceding the United States' entry into the Second World War. Following the attack on Pearl Harbor, the group helped defend the western United States before deploying overseas in early 1942. It traveled through the Pacific to India and served in the China-Burma-India Theater under the Tenth Air Force. Initially equipped with P-40 Warhawks and later P-38 Lightnings, it defended airfields and the Indian and Chinese ends of the Hump air route, conducted patrols and reconnaissance, attacked Japanese positions and shipping, and supported Allied and Chinese ground forces. In 1945 it transitioned to P-51D Mustangs. The wartime group returned to the United States and was inactivated in December 1945. The unit was reactivated on Okinawa in October 1946 as part of the postwar occupation and regional air-defense structure. It served at Yontan and later Naha Air Base, protecting Okinawa and the Ryukyu Islands. During the Korean War, elements of the organization deployed to Japan and Korea and entered combat in September 1950 with F-80C Shooting Stars. The parent 51st Fighter Wing subsequently moved between Japanese and Korean bases while sustaining combat operations under austere conditions. The group converted to F-86 Sabres in 1951 and participated in the air war over Korea until the armistice in July 1953. It then resumed air-defense duties in Okinawa until being inactivated in 1957 under an organizational restructuring. The lineage remained inactive for several decades before being redesignated and reactivated in 1990. It became the 51st Operations Group in February 1992 as the Air Force adopted the operations-group structure. Today, its principal flying units are the 25th Fighter Squadron, operating A-10C Thunderbolt II aircraft, and the 36th Fighter Squadron, operating F-16C/D Fighting Falcons, supported by the 51st Operations Support Squadron. The group is a military organization rather than a commercial consumer brand, and its public identity is principally associated with readiness, deterrence, air defense, and alliance support on the Korean Peninsula.
History
The unit was established as the 51st Pursuit Group (Interceptor) on 20 November 1940 and activated on 15 January 1941. It was redesignated the 51st Pursuit Group (Fighter) in March 1941 and the 51st Fighter Group in May 1942. Its original wartime squadrons included the 16th, 25th, 26th, and 449th Fighter Squadrons. After Pearl Harbor, the group first contributed to the defense of the United States' west coast. In early 1942 it deployed to India by way of Australia and Ceylon, becoming part of the China-Burma-India Theater. Flying P-40s and P-38s, it protected bases and supported the Hump airlift between India and China. Its missions included patrol, reconnaissance, strafing, bombing, and support of Allied ground operations during the Japanese offensive in northern Burma. After moving to China in 1943, it defended the Chinese end of the Hump route and airfields around Kunming, attacked Japanese shipping in the Red River delta, and assisted Chinese forces during operations near the Salween River. P-51D Mustangs replaced its earlier aircraft in 1945. The group returned to India later that year and was inactivated in the United States on 13 December 1945. The group was reactivated at Yontan Air Base, Okinawa, on 15 October 1946, moved to Naha after Yontan closed, and served in the occupation and air-defense forces responsible for Okinawa and the Ryukyu Islands. It was redesignated the 51st Fighter-Interceptor Group in February 1950. When the Korean War began, elements moved first to Japan and then to Korea. The group entered combat on 22 September 1950 with F-80C aircraft while operating from Itazuke, Japan, in support of United Nations forces breaking out of the Pusan Perimeter. The wider 51st Fighter Wing moved among bases in Japan and South Korea and operated in difficult conditions. The group and its associated squadrons transitioned to F-86 Sabres in 1951 and continued fighter operations until the armistice in July 1953. After the war, the organization returned to Naha and continued regional air defense. It supported contingency operations and demonstrated mobility during several East Asian crises, including missions connected with the evacuation of Nationalist Chinese forces from mainland China. The group was inactivated on 25 October 1957 when the parent wing adopted a tri-deputate structure and operational squadrons were assigned directly to the wing. The lineage was redesignated the 51st Tactical Fighter Group in 1985 and the 51st Fighter Group in 1990. It was reactivated on 1 October 1990 and redesignated the 51st Operations Group on 7 February 1992. Since 1990 it has maintained readiness through recurring exercises and operational training for the air defense of South Korea. At Osan, the group now brings together the 25th Fighter Squadron, the 36th Fighter Squadron, and the 51st Operations Support Squadron, integrating aircraft operations with intelligence, weapons control, airfield, weather, communications, and other operational functions.
- 1992
Redesignation as 51st Operations Group
[1]The organization received its current designation on 7 February 1992 as part of the Air Force operations-group structure.
- 1990
Reactivation as 51st Fighter Group
[1]The lineage was reactivated on 1 October 1990 to support renewed operational activity in Korea.
- 1957
Inactivation under wing reorganization
[1]The group was inactivated when the 51st Fighter Wing adopted a tri-deputate organization.
- 1951
Transition to the F-86 Sabre
[1]The group's fighter force transitioned from the F-80 to the North American F-86 during the Korean War.
- 1950
Korean War combat operations
[1]Elements entered combat over Korea in September 1950, initially flying F-80C Shooting Star aircraft.
- 1946
Reactivation on Okinawa
[1]The group was reactivated at Yontan Air Base as part of the postwar occupation and regional air-defense force.
- 1945
World War II inactivation
[1]After returning from the China-Burma-India Theater, the group was inactivated on 13 December 1945.
- 1942
Deployment to the China-Burma-India Theater
[1]The group deployed through the Pacific to India and began operations supporting the Hump air route and Allied forces in Asia.
- 1941
Activation as 51st Pursuit Group
[1]The unit was activated on 15 January 1941 after being established during the prewar expansion of the United States Army Air Corps.
Products and positioning
A forward-deployed United States Air Force operational group focused on combat readiness, air defense, and integrated support for the defense of the Republic of Korea.
A-10C combat aviation · 1993
25th Fighter Squadron
Known as the Assam Draggins, the 25th Fighter Squadron is an operational fighter squadron assigned to the group. It operates A-10C Thunderbolt II aircraft, providing specialized close air support, battlefield attack, and related combat capabilities for forces defending the Korean Peninsula.
F-16C/D combat aviation · 1990
36th Fighter Squadron
Known as the Fiends, the 36th Fighter Squadron operates Block 40 F-16C/D Fighting Falcons. Its multirole fighters support counter-air, interdiction, strike, and other air operations within the defense framework of the Republic of Korea.
Operational support · 1992
51st Operations Support Squadron
The 51st Operations Support Squadron provides the operational infrastructure required by the group's flying squadrons. Its functions include support for airfield operations, intelligence, weather, weapons and tactics, communications, and mission coordination.
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