US Patrol Boat River

Patrol Boat, Riverine, or PBR, is the US Navy designation for a small rigid-hulled patrol boat used during the Vietnam War from March 1966 until 1975. They were deployed in a force that grew to 250 boats, the most common craft in the Mobile Riverine Forces & Task Force 116, and were used to stop and search river traffic in areas such as the Mekong Delta, the Rung Sat Special Zone, the Saigon River as well as coastal areas within  IV Corps.

The PBR was usually manned by a four-man crew, and had a comparatively heavy firepower for their size. consisting of a twin M2HB(12.7 mm) aka 50 cal heavy machine guns forward in a rotating, shielded tub, a single rear M2HB, one or two M60 7.62 mm light machine guns mounted on the port and starboard sides, and a Mk18 Grenade Launcher.