User blog comment:3shady/Viet Cong VS Afghan Mujahideen/@comment-4661256-20141008231945/@comment-25457158-20141008233617

According to this article, the NVA  did use the LPO-50 flamethrower, albeit "limited use".

http://en.wikipedia.org/wiki/Weapons_of_the_Vietnam_War#Flamethrowers_2

Though you are right that it does not really suit guerilla warfare purposes. Would you like to vote on the battle?