NARA advanced search, RG 319, 5307th Composite Unit
The AVG, American Volunteer Group, Flying Tigers became the 23rd Fighter Group in 1942.
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Dear Mr. Wekluk,
Thank you for posting your request on History Hub!
As Mr. Tomko listed, the two units are the 5307th Composite Unit (Provisional) (also known as Merrill’s Marauders or by code name Galahad or Galahad Force) and the American Volunteer Group (AVG) (also known as the Flying Tigers). Galahad Force was reorganized as the 475th Infantry Regiment on August 10, 1944. They had contact with 132nd Infantry Regiment, Americal Division during 1942-1943.
Many of the members of the AVG became part of the 23rd Fighter Group in 1942. One noted member of the AVG was Gregory “Pappy” Boyington who later joined the Marines and commanded the “Black Sheep Squadron” (VMF-214).
Since the United States was not at war when these two organizations were formed, the records pertaining to them prior to 1942 were scattered among various military organizations (click on links above). Also, there are very few records about Merrill’s Marauders because of its mobility and and the loss of their intelligence officer that accumulated the records.
Other units were assigned to the China-Burma-India Theater after 1941. There is not complete listing but one can be compiled using the various publications by the U.S. Army Center of Military History.
For access to the records provided in the links above, please contact the NARA units indicated. Most are in the custody of the National Archives at College Park - Textual Reference (RDT2) and the email is firstname.lastname@example.org.
We hope this information is useful. Best of luck with your research!