Dear Ms. Thompson,
Thank you for posting your request on History Hub!
We searched the Access to Archival Databases (AAD) and located the Records on Military Personnel Who Died, Were Missing in Action or Prisoners of War as a Result of the Vietnam War, documenting the period 6/8/1956 - 1/21/1998 in the Records of the Office of the Secretary of Defense (Record Group 330) that include name searchable files pertaining to individual prisoners of war.
We searched the National Archives Catalog and located 412 record series, 2650 file units, and 650 items relating to Vietnam and prisoners of war in various record groups and collections. Some of these records have been digitized and may be viewed online through the Catalog. For more information about the non-digitized records, please email the reference unit listed in the Catalog description.
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 various NARA units. We apologize for this inconvenience and appreciate your understanding and patience.
For information regarding prisoners of war and U.S. servicemen missing during WWII, Korean War, Vietnam War, Cold War, and other conflicts, we suggest you contact the Defense POW/MIA Accounting Agency (DPAA), Public Affairs Office, 2300 Defense Pentagon, ATTN: External Affairs, Washington DC 20301-2300.
We hope this is helpful. Best of luck with your research!