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Dear Mr. Coates,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 59 series regarding Cambodia in the Records of the United States Forces in Southeast Asia, 1950-1975 (Record Group 472). Information about the mission may be included in these records. For access to these series, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
Various data file listings of American prisoners of war are in the custody of the Electronic Records Division (RDE) and are available via AAD (Access to Archival Databases) on the National Archives website at: https://aad.archives.gov/aad/. Click on "prisoners of war" under the "Genealogy/Personal History" category. A list of the databases will appear. Select the database pertaining to the war in which you are interested.
We hope this is helpful. Best of like with your family research!