Dear Ms. Moore,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Records of the 1st Through 338th and the 559th Infantry Regiment, 1916-1921 in the Records of U.S. Regular Army Mobile Units (Record Group 391) that includes the records of the 34th Infantry Regiment during WWI. For more information about these non-digitized records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org. We were unable to locate specific records of Company K. Records of lower echelon units sometimes were incorporated into the files of the regiment.
Plus, we located the Lists of Incoming Passengers, 1917 - 1938 and Lists of Outgoing Passengers, 1917 - 1938 in the Records of the Office of the Quartermaster General (Record Group 92) that may include the lists on which the soldiers of the 34th Infantry Regiment were sent to France and back to the U.S. during WWI. Please contact RDT2 for more information. These records have been digitized by Ancestry and may be viewed online at U.S., Army Transport Service Arriving and Departing Passenger Lists, 1910-1939. There may be a fee for using Ancestry. Instead, please check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
We also located Muster Rolls and Rosters, 11/1/1912 - 12/31/1943 in the Records of the National Archives and Records Administration (Record Group 64) that include 10 rosters of the 34th Infantry Regiment during WWI. These records have been digitized and are available using the Catalog. In addition, morning reports for Army units from November 1, 1912 to 1959 are in the custody of the National Archives at St. Louis (RL-SL). For more information about the non-digitized records, please contact RL-SL via email at email@example.com. These records may be able to indicate when your grandfather served with the 34th Infantry Regiment.
We suggest that you request 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 before 1959 are in the custody of NARA's National Personnel Records Center (NPRC) 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. Veterans and their next of kin also may use eVetRecs to request records. See eVetRecs Help for instructions. For more information see Official Military Personnel Files (OMPF), Archival Records Requests.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2 and RL-SL. Also, NPRC will continue servicing requests ONLY associated with medical treatments, burials, homeless veterans seeking admittance to a homeless shelter, and those involving the VA Home Loan program. If your request is urgent, please see Emergency Requests and Deadlines. Please refrain from submitting non-emergency requests such as replacement medals, administrative corrections, or records research until NPRC returns to pre-COVID staffing levels. Please check archives.gov/veterans for updates to the NPRC operating hours and status. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your family research!