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.
MACV [or MAC(V)] was the top echelon of command in Vietnam, General Westmoreland’s HQ. Military Assistance Command (Vietnam).