page_title: Marine Aviation Training Support Group 21
section_title: Early years
hierarchical_section_title: Marine Aviation Training Support Group 21 / History / Early years
caption_attribution_description: English: Scanned from Insignia and Decorations of the U.S. Armed Forces - revised edition December 1. 1944, pg. 183. Washington D.C.: National Geopgrahic Society
context_page_description: Marine Aviation and Training Support Group 21 is a United States Marine Corps aviation training group that was originally established in 1922 as the 2nd Aviation Group. During World War II the unit was known as Marine Aircraft Group 21. Squadrons from MAG-21 fought in many of the opening battles of the war to include the Battle of Wake Island, Battle of Midway and as part of the Cactus Air Force during the Battle of Guadalcanal The group was deactivated following the end of the war and was not reactivated until 2000 when the Marine Aviation Detachment at Naval Air Station Pensacola, Florida was renamed MATSG-21. The core of the MATSG personnel is derived from 175 officer instructors and 550 student naval aviators/naval flight officers.
context_section_description: The 2nd Aviation Group was formed at Naval Air Station San Diego in August 1922.  They were redesignated Aircraft Squadrons, West Coast Expeditionary Force in July 1926.  January 8, 1934 saw another name change, this time to Aircraft Two, Fleet Marine Force.  On May 1, 1939, they were redesignated again to the 2nd Marine Aircraft Group.  The group was sent overseas to Marine Corps Air Station Ewa, Hawaii in January 1941.  There they consolidated with the headquarters of the 2nd Marine Aircraft Wing July 10, 1941, and less than a month later they were redesignated Marine Aircraft Group 21.
caption: MAG-21 insignia during World War II.
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