Is this a separate mod or do you need to have PR installed to play it?
AFAIK it´s an add-on, like PR:Normandy. So yes, you need to have PR installed.
The Vietnam setting is really interesting and I´m excited to see how it´ll play out with PRs mechanics. The insurgency game mode would work quite well to represent "search and destroy"-missions and jungle warfare will add a cool experience to that game mode.
Will definately download it and, since I´ve got enough time again, play-test it.