Marine Aviation Training Support Group 21
A United States Marine Corps aviation training support command serving Marine personnel at major naval air-training installations on Florida's Gulf Coast.
Last updated October 14, 2026
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Overview
Marine Aviation Training Support Group 21, commonly abbreviated MATSG-21, is a United States Marine Corps aviation training support command headquartered at Naval Air Station Pensacola, Florida. Although its present mission is administrative and instructional support rather than the operation of a conventional combat aircraft group, the organization carries forward the lineage of a Marine aviation formation established in 1922. Its institutional history includes service as the 2nd Aviation Group, several subsequent redesignations, and the World War II-era Marine Aircraft Group 21, or MAG-21. The unit's current role is to support Marines assigned to or undergoing training at Naval Air Station Pensacola, Naval Air Station Whiting Field, and Naval Air Station Corry Station. It provides administration, monitors the movement of Marine students through the Naval Air Training Command, reinforces Marine Corps standards and discipline, and delivers training that is distinctively Marine Corps in character. The command also provides ceremonial assistance, including color guards and advisers for special details at military and community events. MATSG-21's personnel structure is built around a relatively small cadre supporting a much larger student population. Reference material describes a core of approximately 175 officer instructors and about 550 student naval aviators and naval flight officers. The group therefore functions as a bridge between the Navy-led aviation training system and the Marine Corps personnel who pass through it. Its activities include leadership development, physical fitness, professional military education, martial arts, pistol qualification, tactics, community involvement, and other preparation for Marines awaiting or completing occupational-specialty training. The historical lineage began when the 2nd Aviation Group was formed at Naval Air Station San Diego in August 1922. It was redesignated Aircraft Squadrons, West Coast Expeditionary Force, in 1926; Aircraft Two, Fleet Marine Force, in 1934; and the 2nd Marine Aircraft Group in 1939. The formation moved to Marine Corps Air Station Ewa, Hawaii, in January 1941 and was consolidated with the headquarters of the 2nd Marine Aircraft Wing in July of that year. It became Marine Aircraft Group 21 shortly afterward. During the Second World War, MAG-21 and its squadrons were associated with several early and important Pacific campaigns. The group suffered 17 casualties and lost all 21 of its aircraft during the Japanese attack on Pearl Harbor on 7 December 1941. Its squadrons subsequently participated in actions connected with Wake Island, the Battle of Midway, and the Guadalcanal campaign, including service with the Cactus Air Force. The group later operated from Banika in the Russell Islands, Efate, and Guam as Marine aviation forces expanded their operations against Japanese positions in the Solomon Islands and elsewhere in the Pacific. After the war, the formation returned to Marine Corps Air Station Miramar in March 1946 and later moved to Marine Corps Air Station Cherry Point. It was decommissioned in June 1947. The lineage was revived in a different operational form in May 2000, when the Commandant of the Marine Corps directed the Marine Aviation Training Support Group at Naval Air Station Pensacola to be redesignated MATSG-21. The change was intended to preserve Marine Corps identity and connect the modern support command with the history of earlier formations carrying the number 21. Hurricane Ivan caused extensive damage to Naval Air Station Pensacola in 2004, including damage to buildings used by MATSG-21. The command temporarily relocated to the Parachute Rigger Building on Farrar Road. In the years that followed, its remit continued to include training support along the Gulf Coast, as well as support for reconnaissance and reserve-related activities. MATSG-21 is best understood not as a consumer-facing commercial brand but as a military organizational identity whose value lies in lineage, readiness, training, administration, and continuity within Marine aviation.
History
The lineage associated with MATSG-21 began at Naval Air Station San Diego in August 1922, when the 2nd Aviation Group was formed. The organization underwent successive redesignations as Marine aviation structures evolved: it became Aircraft Squadrons, West Coast Expeditionary Force, in July 1926; Aircraft Two, Fleet Marine Force, in January 1934; and the 2nd Marine Aircraft Group on 1 May 1939. In January 1941, the group moved overseas to Marine Corps Air Station Ewa, Hawaii. On 10 July 1941 it consolidated with the headquarters of the 2nd Marine Aircraft Wing, and less than a month later it was redesignated Marine Aircraft Group 21. The formation was at Ewa during the Japanese attack on Pearl Harbor on 7 December 1941. It suffered 17 casualties and lost all 21 of its aircraft. Squadrons associated with the group took part in the Battle of Wake Island, the Battle of Midway, and the Guadalcanal campaign as elements of the Cactus Air Force. Although MAG-21 remained at Ewa until February 1943, its squadrons were active in combat operations. The group then departed for Banika in the Russell Islands. By June 1943, its squadrons were conducting large-scale operations against Japanese installations in the northern Solomon Islands. In November 1943 the group moved to Efate, where it remained until June 1944. Its final wartime base was Guam, where it was stationed from August 1944 through the end of the war. After the conflict, the group returned to Marine Corps Air Station Miramar in March 1946 and subsequently moved to Marine Corps Air Station Cherry Point. It was decommissioned in June 1947. The historical number was later assigned to a modern training-support organization. In May 2000, the Commandant of the Marine Corps ordered the Marine Aviation Training Support Group at Naval Air Station Pensacola to be redesignated Marine Aviation Training Support Group 21. The broader redesignation program was intended to reinforce Marine Corps identity and preserve the traditions and history of earlier formations. In its modern form, MATSG-21 provides administrative and training support to Marines at Naval Air Station Pensacola, Naval Air Station Whiting Field, and Naval Air Station Corry Station. The command monitors Marine students as they progress through the Naval Air Training Command, maintains Marine Corps discipline, and provides Marine-specific instruction. It also supports base and local events through color guards and special-detail advisers. The command's Enhanced Training Program provides structured activities for Marines waiting to begin military occupational specialty schooling. These activities include leadership education and development, martial arts, pistol qualification, tactics, physical fitness, professional military education, and community involvement. The group also oversees training support along the Gulf Coast and has supported reconnaissance and reserve-related activities. Hurricane Ivan damaged its facilities at Naval Air Station Pensacola in 2004, requiring a temporary move to the Parachute Rigger Building on Farrar Road.
- 2004
Temporary relocation after Hurricane Ivan
[1]Damage at Naval Air Station Pensacola forces MATSG-21 to relocate to the Parachute Rigger Building on Farrar Road.
- 2000
MATSG-21 is re-designated
[1]The Pensacola aviation training support group receives the MATSG-21 designation in May, preserving the identity and lineage of the earlier formation.
- 1947
World War II-era group is decommissioned
[1]Following postwar movements through MCAS Miramar and MCAS Cherry Point, the group is decommissioned in June.
- 1944
Moves to Guam
[1]After service at Efate, the group reaches Guam in August for its final wartime basing period.
- 1943
Moves to Banika
[1]The group departs Ewa in February for Banika in the Russell Islands.
- 1941
Moves to Hawaii and becomes MAG-21
[1]The group moves to MCAS Ewa in January, consolidates with the 2nd Marine Aircraft Wing headquarters in July, and is redesignated Marine Aircraft Group 21 shortly afterward.
- 1941
Pearl Harbor attack
[1]MAG-21 suffers 17 casualties and loses all 21 aircraft during the attack on 7 December.
- 1939
Becomes the 2nd Marine Aircraft Group
[1]The organization is redesignated on 1 May.
- 1934
Redesignated Aircraft Two, Fleet Marine Force
[1]A further redesignation takes effect on 8 January.
- 1926
Redesignated Aircraft Squadrons, West Coast Expeditionary Force
[1]The organization receives a new designation as Marine aviation force structures are reorganized.
Products and positioning
A Marine Corps aviation training-support command that connects Navy-led flight training with Marine Corps administration, discipline, professional development, and institutional identity.
Marketing campaigns
- 1943Northern Solomon Islands operations
Pacific theater
After moving to Banika, the group's squadrons conducted large-scale operations against Japanese installations in the northern Solomon Islands.
Outcome. The group continued forward aviation operations from the Russell Islands and later Efate.
- 1942Pacific island operations
Pacific theater
Squadrons associated with MAG-21 participated in operations at Wake Island, Midway, and Guadalcanal, including service with the Cactus Air Force.
Outcome. The squadrons contributed to early Marine aviation operations in the Pacific campaign.
- 1941Pearl Harbor defense
Pacific theater
The group was present at MCAS Ewa during the Japanese attack on Pearl Harbor and suffered severe personnel and aircraft losses.
Outcome. The formation lost all 21 aircraft and 17 personnel were killed or wounded, according to the reference account.
Brand decisions
2000
Restore the number 21 designation to the Pensacola training commandStrategyBackground
The Marine Corps sought to strengthen organizational identity and maintain continuity with historic aviation formations.
Action taken
The Commandant directed the Marine Aviation Training Support Group at Naval Air Station Pensacola to become MATSG-21.
Aftermath
The modern training-support command inherited the historical numerical identity and associated lineage of MAG-21.
Sources1 sources
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