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In order to request an Official Military Personnel File, which will contain his unit information (possibly multiple) as a part of his military service record, please complete a Standard Form 180 and mail it to:
National Personnel Records Center
1 Archives Dr.
St. Louis, MO 63138
Official Military Personnel Files are open to the public if the veteran was completely separated from service 62 years from today's date or prior. Thus, if your veteran left service on November 14, 1954 or prior then you receive copies of the record for a fee. You may find more information and the Standard Form 180 at: https://www.archives.gov/veterans/military-service-records
National Archives at St. Louis