I was assigned to the Vung Tau Army Airfield Security Platoon before I requested a transfer. I wound up in Bravo 1-61 1/5th mech Vietnam. It wasn't hard to find the money changers in Vung Tau. I don't know about Quang Tri having many of them, but I wouldn't be surprised. IMHO, just about any city where you could go off post when you were off duty had them in South Vietnam.
I must have passed through for all of 20 minutes?
Then LZ Nancy, Sally, Sharon and many no name places.
Who could remember this stuff?
For the most part it may be better to forget.
Since getting out I have NEVER met another guy from the 5th Mech? Just had to be many of us? Not so many from Illinois.