Vietnam Studies U.S. Army Special Forces 1961-1971
Special Forces (United States Army)-Wiki page
You said you were stationed in Oki, so I'm thinking that he was part of 1st Gp. 5th Gp also made a up a large contingent of the mission in the RVN.
Just got off the phone with my dad, and he tells me that he was with the 1st Group. He says he did three tours in Vietnam. '64 through '66, '69, and '70. He was also with a command(?) called MACV.
He's going to send me a detailed breakdown of all of his assignments during his Nam years. Today was the first time I ever asked him directly about where he was and what he did during Nam. He was happy to share with me, which was surprising to me, as he's never talked much about it in the past.
Thanks for the links.