I'm afraid that wasn't it either. I was in IV Corps Viet Nam, Soc Trang, in 1968 and III Corps, Di An, in 1969.
One beer huh. We had an Air Force FAC team assigned to our Air Cav Squadron at Di An. They worked out a deal with the F-4 jocks that they worked with. We were to let them fly as gunner in the front seat of our Cobras in exchange for a flight in their F-4s. We had one pilot fly with us and never heard from them again. I guess we should have charged him a beer and gotten a little something out of the deal.
You must be a couple of years older than I am to have been there way back then. Things got real interesting in 1968.