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Do you have any other information? The Jack J. Devereux above had a wife named Grace.
Dear Ms. Duncan,
Thank you for posting your request on History Hub!
We suggest that you request a copy of Jack Devereux’s 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 1958 are in the custody of NARA’s National Personnel Records Center in St. Louis. 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 NARA’s National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. You can also fax the form to 314-801-9195. For more information see Official Military Personnel Files (OMPF), Archival Records Requests.
Also, we searched the National Archives Catalog and located the Records of Pioneer Infantry Regiments, 1917-1919 in the Records of American Expeditionary Forces (World War I) (Record Group 120) that may have information about the 815th Infantry Pioneer Regiment. Additionally, we located a series titled Card File of Military Engagements of American Organizations, 1918 - 1918 in the Records of the War Department General and Special Staffs (Record Group 165) that includes a file unit titled Pioneer Infantry that may be of interest to you. For access to and/or copies of these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
We hope this is helpful. Best of luck with your research!