All good, but particularly these two:
"The problems are within, and they are going to require a whole different set of answers - many of which exceed the capabilities of the military or the use of military force, either conventionally or in COIN.

Steve's point re the use of North Vietnamese histories is a good one. They tend to downplay the role of the southern agents -- and their very different agendas, many of which did not include unification with the north."
That last very important point is missed by most...