Hello, most likely not, unless they happened to be in a borrowed row boat from some villager. The typical boat that was used on the rivers of Vietnam was the Patrol Boat, River (PBR). It was a 4 man crewed vessel with multiple heavy weapons such as the M2 Browning .50 cals, Mk 19 grenade launcher and M60's. It was made out of fiberglass and designed to be fast in order to support Navy SEALs and patrol the rivers of Vietnam.