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Dear Ms. Crossar,
Thank you for posting your request on History Hub!
The unit information you seek may be contained in his burial case file (later called the Individual Deceased Personnel File or IDPF). Burial case files from 1915-1976 are in the custody of the National Archives at St. Louis, ATTN: RL-SL, P.O. Box 38757, St. Louis, MO 63138-1002. Please contact them regarding access to these records. Their email address is firstname.lastname@example.org.
We hope this is helpful. Best of luck with your family research!