The intention was, as you suggest, more conventional battle fields though it shouldn’t be impossible.
Though we do include rules for “air assault infantry’ which are intended for things like “Nam or Afghanistan.
Many of the Assets available could work well too, particularly Commandos, Partisans and so on.
Engagement ranges are relatively short on the tabletop, so you’ll have to evaluate how that translates in very dense terrain, but it shouldn’t be unsolvable.
I have never thought of it, but it might be interesting at this scale. You could include some logistical elements, such as the need to have LZ’s secured for the US to stay supplied and disallow airstrikes and fir support for NVA units in contact with US units “hold on to their belts.”