All manner of kit as used through the French war, the bulk being US but also ex-British, like Coventries and the odd Universal carriers and even a few French items like the post-war version of the Panhard 178.
I think CoC would work quite well for the war, It's what I have in mind if I ever get around to finishing mine.
There is a problem with the range in so far as it is quite limited in scope and time period. It was designed around Dien Bien Phu and so, depending on how anally retentive you are, the figures don't make ideal matches for other time frames or theatres of the conflict. Not surprisingly it focusses on late war French and colonial paras. You aren't likely to have seen such units trolling around the south or being lifted by LVTs and Crabs (C model Weasels). The uniforms for the French paras rather limit them to late 1953/54 if you are a button counter. The Vietnamese ones appear to be wearing more of a mix of sausage skins and US camo so maybe a bit earlier. Having not seen the Vietnamese ones in the flesh I dunno if you can just head swap them to make earlier French paras.
Of course if you fancy fighting Dien Bien Phu or even dropping them over Suez in 1956 then the French paras are ideal. The only support weapons you might want are a 57mm RCL, the M-24 Chaffee and if you fancy a quad .50 cal on a Maxson mount and trailer. Both Company B and Warlord make Chaffees.
Hopefully FNG will make some infantry at some point in the future.