Dear Mr. Callen,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series 201 Files, ca. 1918 - ca. 1920 in the Records of the Adjutant General’s Office (Record Group 407) that contains information about prisoners of war and enemy aliens in the U.S. The series Records Relating to Base Hospitals and German Prisoners of War, 1917-1918 in Record Group 407 may include some relevant information. We also located the series Monthly Rosters of German Prisoner of War Labor Companies Numbered 2-266, 1918-1919, the series Correspondence, Telegrams, and Reports of German Prisoner of War Labor Companies Numbered 2-122, 1918-1919, the series Field Reports of Enemy Prisoners of War Captured by U.S. Military Organizations, 1918-1919, and the series Lists of Enemy Prisoners of War Interned by the American Expeditionary Forces in France, 1918-1919 in the Records of the American Expeditionary Forces (World War I) (Record Group 120) that may be of interest to you. These records have not been digitized. Please contact the National Archives at College Park - Textual Reference (RDT2) at email@example.com for assistance with these and similar records. If you have more information, such as where the men were captured or held, then we may be able to locate potentially relevant resources.
We also located Gorrell's History of the American Expeditionary Forces Air Service, 1917-1919 in Record Group 120 that includes reports of downed American aviators who were prisoners of war. For more information about this history, please contact RDT2 at firstname.lastname@example.org.
This history has been digitized and is available online from Fold3.com. Please note that there may be a fee for using this service. Instead, please check for access at your local library as many library systems subscribe to this site, making it free for their patrons.
Due to the continued impact of COVID-19, you may experience a delay in receiving an initial acknowledgment as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience as we balance mission-critical work and the safety of our staff during the pandemic. Please check NARA’s web page about COVID-19 updates for the latest information.
Finally, for German military information, you may wish to contact the Bundesarchiv Abt. VI - Militärarchiv, Wiesentalstraße 10, 79115 Freiburg, Germany.
We hope this is helpful. Best of luck with your research!