Would you want to post his name and any other information that you may have birthplace, etc.?
Dear Ms. Balciunas,
Thank you for posting your request on History Hub!
If he was not a citizen or legal resident of the United States, he could have been a civilian employee of the U.S. Army. Official Personnel Files (OPFs) and medical information for individuals who worked for the U.S. government in a civilian capacity prior to 1952 are in the custody of the National Archives at St. Louis, P.O. Box 38757, St. Louis, MO 63138. Please include the full name used during Federal employment, date of birth, name and location of employing Federal agency, beginning and ending dates of Federal Service. If you do not know any of this information, you may omit it or give estimates, however the more information you provide, the easier it will be for NARA staff to locate the correct files. For more information, the web site is https://www.archives.gov/st-louis/civilian-personnel
Please note that the National Archives and Records Administration (NARA) has suspended reproduction and digitization services until further notice due to COVID-19. Orders will not be serviced until operations can resume safely. Once operations resume, document reproduction requests will be filled in the order in which they were received. We apologize for any inconvenience.
We hope this is helpful. Best of luck with your family research!