If you are familiar with the Vietnam War, you probably know what PBR’s (Patrol Boat River) are. The PBR crews were some of the bravest personnel of the war in my opinion. Well, apparently Colt manufactured some of the bow twin .50 caliber machine gun turrets for the PBR’s.
These turrets were also seen on Patrol Air Cushion Vehicles (PACV) used in the war.
I am not familiar with turret/weapon configuration shown below being used in active service.