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Dear Mr. Cherry,
Thank you for posting your question to the History Hub.
Without knowing which sources from the Pentagon you are referring to, it is difficult for us to recommend specific resources for you to review. We do, however, have a few general suggestions.
A quick search of the National Archives Catalog reveals several series which may contain information related to your search. The series Vietnam Conflict Prisoners of War (POW), Missing in Action (MIA), and Detainee Intelligence Files from Record Group 319: Records of the Army Staff, for example, includes “information concerning U.S. military personnel who had been declared Prisoners of War (POW) or Missing in Action (MIA) while serving in Cambodia, Vietnam, and Southeast Asia during the Vietnam War.” Another example is the series Reports Relating to U.S. Military Prisoners of War (POWs) and Missing in Action (MIA) from RG 472: Records of the U.S. Forces in Southeast Asia, which includes “reports relating to U.S. military prisoners of war (POWs) and missing in action (MIA) obtained through the interrogation of sources by the Combined Military Interrogation Center (CMIC).” You can search the National Archives Catalog for further potentially relevant series.
Additionally, this page on our website “provides an overview of the electronic data records in the custody of the National Archives that relate to U.S. military casualties, missing in action, and prisoners of war from the Vietnam War era,” and this page provides an overview of our Vietnam War Records.
Finally, you might also want to review news reports and interviews, which may include references to specific sources.
Thank you, again, for sharing your question with the History Hub.