Dear Mr. Brown,
Thank you for posting your request on History Hub!
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. For more information see Official Military Personnel Files (OMPF), Archival Records Requests.
The 151st Infantry Regiment was assigned to the 76th Infantry Brigade, 38th Division. We searched the National Archives Catalog and located a series titled Records of Divisions, 1917 - 1920 and Records of Infantry Brigade, 1917 - 1919 in the Records of the American Expeditionary Forces (World War I) (Record Group 120) that includes records of the the 38th Division and the 76th Infantry Brigade respectively. We also 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 include the records of the 151st Infantry Regiment during WWI.
While unit records generally do not have information about each soldier assigned to a unit, they may have some records pertaining to the soldier, and can also be used to learn about the activities of the unit as a whole. For more information about these non-digitized unit records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
Casual Detachments were temporary groupings of soldiers detached from a unit for a particular duty or function. In the context of World War I, soldiers were often assigned to casual detachments for purposes such as being shipped overseas prior to being assigned to an operational unit, or for administrative control over soldiers that were being demobilized and returned to the United States for eventual discharge. Records pertaining to casual detachments are sometimes included with records of their parent units.
Next, we located 5 record series relating to Camp Pike in Records of U.S. Army Continental Commands (Record Group 393). For more information about these records, please contact the National Archives at Washington, DC - Textual Reference (RDT1) at email@example.com.
Additionally, morning reports and rosters may sometimes be used to determine when a soldier served in particular units. Copies of most of the Army unit monthly rosters from November 1912 - 1943 and morning reports for Army units from November 1, 1912 to 1959 are in the custody of the National Archives at St. Louis, MO. For more information about these records, please contact the National Archives at St. Louis (RL-SL) via email at firstname.lastname@example.org.
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, RDT1 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!