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PBR's Mark 1 and Mark 2 were 31' 6'' long Built on a revised cabin crusier hull by Uniflite in Bellingham Washington. I served on Mark 2's in 1969-1970 --- KJM
A PT boat is somewhere around 80 feet long, made of mahogany, powered by three Packard V-12 engines, and was intended to launch torpedoes against enemy ships. The PT boat was designed to operate in open ocean. A Swift boat is 50 feet long, made of aluminum, powered by two Detroit Diesel 12V71 engines, and was used in counterinsurgency operations, mostly up Vietnam's rivers. Now for the third kind of military boat: the PBR--Patrol Boat, River. It's a 31-foot fiberglass boat with two Detroit Diesel 6V53 engines attached to Jacuzzi jet pumps, and it's made to patrol the rivers. When a PBR is fully loaded, it only draws two feet of water.
Highway Patrol - 1955 Suicide 3-31 was released on: USA: May 1958
Space Patrol - 1950 The Hidden Reflector 1-31 was released on: USA: 28 July 1951
Border Patrol - 1959 The Vegetable Man 1-31 was released on: USA: 27 October 1959
The Rat Patrol - 1966 The Fire and Brimstone Raid 1-31 was released on: USA: 26 April 1967
Disneyland - 1954 The B-R-A-T- Patrol 31-4 is rated/received certificates of: Australia:G Iceland:L
Highway Patrol - 1955 Stolen Plane Copter 2-31 was released on: USA: 6 May 1957
The Rat Patrol - 1966 The Fire and Brimstone Raid 1-31 is rated/received certificates of: Canada:PG (video rating)
Space Patrol - 1950 Mystery of the Flying Pirate Ship 2-31 was released on: USA: 2 August 1952
Border Patrol - 1959 Passport to the Deep 1-4 was released on: USA: 31 March 1959
Space Patrol - 1950 Runaway Planetoid 3-5 was released on: USA: 31 January 1953