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Dear Mr. Frailing,
Thank you for posting your request on History Hub!
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 4th Infantry Pioneer Regiment. 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. Also, you may wish to ask RDT2 for information about the 3rd Pioneer Infantry Regiment as well since we located a William Samuel Abraham in that World War I unit via Ancestry (see below)
We also located the series titled the Draft Registration Cards, 1917-1918 in the Records of the Selective Service System (World War I) (Record Group 163) that are in the custody of the National Archives at Atlanta (RE-AT). For access to and/or copies of these records, please contact RE-AT via email at firstname.lastname@example.org.
We suggest that you request a copy of your grandfather’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 OR view the record by visiting the NPRC Archival Research Room in St. Louis, MO. For more information see Official Military Personnel Files (OMPF), Archival Records Requests.
Lastly, we searched Ancestry and located a World War I Army Transport Passenger listing for Wiliam Samuel Abraham (lists him in the 3rd Pioneer Infantry); his World War I Draft Registration Card; and his grave site in Carver County, Minnesota using the information provided. There may be a fee for using Ancestry. Instead, you may view these records online at one NARA's facilities for free via a NARA PC. For the nearest NARA location, please consult our web page at https://www.archives.gov/locations/. Also, some of the images from Ancestry are available for free on Family Search at https://www.familysearch.org/en/.
We hope this is helpful. Best of luck with your family research!