Dear Mr. Spencer,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog but we were unable to locate any record series that contained statements, interviews or debriefs of former prisoners of war from WWI. We did locate the series Correspondence Relating to American Prisoners of War in Germany, 1918 - 1919 in the Records of the American Expeditionary Forces (World War I) (Record Group 120) but although there are lists of prisoners, most of the records consist of general administrative matters. We also located Gorrell's History of the American Expeditionary Forces Air Service, 1917 - 1919 in Record Group 120 that includes records related to downed U.S. airmen. For more information about these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at Archives2reference@nara.gov.
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. We apologize for this inconvenience and appreciate your understanding and patience.
The U.S. Army Heritage & Education Center, 950 Soldiers Drive, Carlisle, PA 17013, has a collection of veteran questionnaires that includes some accounts of former prisoners of war relating to their experiences during WWI.
Accounts of individual POW experiences from WWI are sometimes contained in personal recollections such as memoirs and letters reproduced in newspapers. Chronicling America: Historic American Newspapers provides information about accessing historic newspapers.
We hope this is helpful. Best of luck with your research!