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Dear Mr. Brown,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Records of the 1st Through 338th and the 559th Infantry Regiment, 1/1/1916 - 12/31/1921 in the Records of U.S. Regular Army Mobile Units, 1821-1942 (Record Group 391). For access to and/or copies of the records of the 55th Infantry Regiment, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
Also, you may wish to have a copy of his Official Military Personnel File (OMPF). OMPFs and individual medical reports for enlisted men of the U.S. Army who were separated from the service after October 1912 and prior to 1957 are in the custody of the National Archives at St. Louis (RL-SL). In many cases where personnel records were destroyed in the 1973 fire, proof of service can be provided from other records such as morning reports, payrolls, and military orders, and a certificate of military service will be issued. Please complete a GSA Standard Form 180 and mail it to the National Archives at St. Louis (RL-SL), 1 Archives Drive, St. Louis, MO 63138-1002.
We hope this information is helpful. Best of luck with your family research!