May I ask where you've got this information from?

Although many Native American men served in the US Armed Forces in South Vietnam, none of them apparently served as code talkers during the Vietnam War. Since you last asked this question, I took the time to search in two of the largest and most complete archives related to the American participation in the Vietnam War without any results. I've also checked contemporary divisional newspapers that usually have little interesting tidbits without any success. I've also referenced academic works on the involvement of indigenous peoples (North American and Australian) in the war without finding any mention of their use as code talkers. If you, or anyone else have information that I'm missing then I'd love to hear about it.