Contre Les Viets is a Vietnam variant of Arty Contliffe’s Crossfire. You need the original rules to play.
vietnam
Incoming!: Vietnam Rules For Crossfire
Incoming! is a set of modifications for using Arty Conliffe’s Crossfire game for the Vietnam War.
Fields of Fire Vietnam Website
Fields of Fire is an online community for Vietnam wargamers. The site has a lively discussion forum, and focuses both on miniature wargames and on role playing games. Among the games supported are the classics Recon, from Palladium and RAFM’s Charlie Company, both of which I own and have enjoyed.
De Bellis Vietnam
De Bellis Vietnam is a set of DBA-based quick and dirty rules for wargaming Vietnam.
Low Level Hell
Low Level Hell is a set of free wargames rules for helicopter actions in Vietnam.