A lot of people have been saying this, but if nesa actually follows that pattern of testing things not tested in a while (ahem ahem paradoxes, anomalies, inconesistneces) then i think:
- effectiveness of strategies and tactics
- impact of war on vietnamese civilians (perhaps combined with consequence of us involvement; from key feature)
- us foreign policy to 1964 (like domino theory, containment, ecnomic self-interest, prestige)
- reasons for communist victory (i dont think so cos its too esay, their not gonna make it easy)
i have no idea about laos/cambodia because i never learnt that (am i screwed)