You were in the Highlands so yes, most of your encounters would have been with NVA. This film depicted much of what you just said. They just never ran out of people and was generously supplied by both Russia and China.
You act like you know all about the war, and; frankly your posts reveal how little you really do know about the enemy and war. Our recon teams ran into NVA in Cambodia from just south of the Tri border area 56 K’s NW of Duc Co SF camp in II Corps down to west of Song Be in III Corps. I mainly ran OPS on the border from west of Duc Lap SF camp to south in Bu Gia Map and to the border and back towards Duc Co near the Ia Drang valley. The NVA were in Bu Gia Map as were main force VC units. West of Duc Lap became hot in late Aug 68 and they hit the camp. The II Corps Mike Force followed by the 5th Group Nha Trang Mike Force kicked the crap out of the NVA and ran then back across the border. Our rules in Cambodia kept us limited to 12 men and only gunships. There were a few exceptions granted. Besides those rules I had no other restrictions, I had an URC 10 radio and could get TAC air fast, I often had two F-100’s, the two F-4’s for support as we were far from arty support. We also had our own AF 20th SOS gunships.
I was sent to Nebraska Omaha in 70-72 by the Army and the VVAW came in 71 or so. We active military guys there tore those VVAW wannabes to shreds. They left fast.