Swift Boat Owasco PCF71

Swift Boat PCF71 in Vietnam, showing forward twin .50 caliber (12.7 mm) machine guns directed upward in their secured position.

Four Swift Boats

Four Swift Boats in Vietnam, showing rear .50 caliber (12.7 mm) machine gun and grenade launcher mount.

Patrol Craft Fast (PCF), also known as Swift Boats, were all-aluminum, 50-foot (Bad rounding hereScript error m) long, shallow-draft vessels operated by the U.S. Navy, initially to patrol the coastal areas and later for work in the interior waterways as part of the Brown Water Navy to interdict Vietcong movement of arms and munitions, transport Vietnamese forces and insert SEAL teams for counterinsurgency (COIN) operations during the Vietnam War.



The Swift Boat was conceived in a Naval Advisory Group, Military Assistance Command Vietnam (NAVADGRP MACV) staff study titled "Naval Craft Requirements in a Counter Insurgency Environment," published 1 February 1965. It noted that "COIN water operations are difficult, demanding, and unique. A prevalent belief has been that COIN craft can readily be obtained from existing commercial and naval sources when needed. Unfortunately, no concerted effort has been made to develop COIN craft specifically suited to perform the many missions needed to combat insurgent activities."

The study went on to list characteristics of the ideal patrol craft:

  • Reliable and sturdy
  • Non-wooden hull, with screw and rudder protection against groundings
  • Self-sufficient for 400 to 500 mile (600 to 800 km) patrol
  • Speed of 20 to 25 knots (37 to 46 km/h)
  • Small high-resolution radar range 4 to 6 miles (7 to 11 km)
  • Reliable long-range communications equipment, compatible with Army and Air Force
  • Quiet
  • Armament for limited offense
  • Sparse berthing, no messing
  • Depth meter, accurate from 0 to 50 feet (15 m)
  • Small, powerful searchlight

The study was positively received, and the Navy began to search for sources. Sewart Seacraft of Berwick, Louisiana, built water taxis for companies operating oil rigs in the Gulf of Mexico, which appeared nearly ideal. The Navy bought their plans, and asked Sewart Seacraft to prepare modified drawings that included a gun tub, ammo lockers, bunks, and a small galley. The Navy used those enhanced plans to request bids from other boat builders, but Sewart Seacraft was selected.

Mark IEdit

The Swift Boats had welded aluminum hulls about 50 feet (15 m) long with 13 ft (4 m) beam, and draft of about five feet (1.5 m). They were powered by a pair of General Motors 12V71"N" Detroit marine diesel engines rated at 480 hp (360 kW) each, with a design range from 320 nautical miles (Bad rounding hereScript error km) at 21 knots (590 km at 39 km/h) to about 750 nautical miles (Bad rounding hereScript error km) at 10 knots (1390 km at 19 km/h). The normal complement for a Swift Boat was six: an officer in charge, a boatswain, a radar/radioman, an engineer, and two gunners. In 1969 the crew was supplemented with a Vietnamese trainee.

The first two PCFs were delivered to the Navy in late August 1965. The original water taxi design had been enhanced with two .50 caliber M2 Browning machine guns in a turret above the pilot house, an over-and-under .50-caliber machine gun – 81 mm mortar combination mounted on the rear deck, a mortar ammunition box on the stern, improved habitability equipment such as bunks, a refrigerator and freezer, and a sink. The 81 mm combination mortar mounted on the rear deck was not a gravity firing mortar as used by the Army and Marine Corps, in which the falling projectile's primer struck the fixed firing pin at the base of the mortar tube, but a unique lanyard firing weapon in which the projectile was still loaded into the muzzle. The gunner could "fire at will" by the use of the lanyard. The weapon had been tested in the 1950s, discarded as the U.S. Navy lost interest in the system. The United States Coast Guard maintained the gun/mortar system before the Navy incorporated it into the PCF program. Many boats also mounted a single M60 machine gun in the forward peak tank, just in front of the forward superstructure.

The original order for 50 boats was followed shortly by an additional order for 54 more Mark I's.

Mark II & IIIEdit

In the latter half of 1967, 46 Mark II boats, with a modified deck house set further back from the bow. The newer boats also had round port holes (replacing larger sliding windows) in the aft superstructure. From 1969 through 1972, 33 Mark III's, which were a larger version of the Mark II's, arrived in Vietnam.


Although 193 PCFs were built, only about 110 served in Vietnam and the two training bases in California; with remaining PCFs being sold or given to nations friendly to the United States. The original training base for Swift Boats had been at the Naval Base in Coronado, California, and in 1969 moved to Mare Island near San Pablo Bay, California where it remained throughout the Vietnam war. PCF training boats frequently transited from Mare Island, through the Golden Gate bridge, then either north or south along the coastline. The only Swift Boat known to be lost while stationed at the new training base was PCF-8, when it sank during a storm off of Bodega Bay, California in December 1969. No crewmen were lost.

Vietnam ServiceEdit

Fast Patrol Crafts operating up a river 2

PCFs carry a group of Vietnamese marines up a narrow canal for insertion.

The first swift boats arrived in Vietnam in October 1965. Initially used as coastal patrol craft, their shallow draft and low freeboard limited their seaworthiness in open waters. These limitations, plus the difficulties being encountered in the interior waterways by the smaller, more lightly armed PBRs led to the incorporation of Swift boats to patrol the 1,500 miles of interior waterways of Vietnam.[1] Swift boats continued to operate along the Vietnamese coastal areas, but their primary area of operations soon centered upon the Mekong Delta area in the southern tip of Vietnam. The delta was composed of ten thousand square miles of marshland, swamps and forested areas all interlaced by rivers and canal ways. Thick brush and vegetation in the delta provided excellent cover, and the region was in the control of the Viet Cong. The US Navy intended to exert its presence and control the waterways.

Boats generally operated in teams of three to five. Each boat had an officer in charge, one of whom would also be placed in overall charge of the mission. Their missions included patrolling the waterways, searching water traffic for weapons and munitions, transporting Vietnamese marine units and inserting Navy SEAL teams. Coming back down river was always more dangerous then going up river. The passage of a patrol assured their eventual return, giving opportunity for the Viet Cong to set up an ambush. Ambushes were typically set at a river bend or in a narrow canal that restricted the maneuverability of the boats.[2] Boats were attacked with recoilless rifles, B-40 rockets, .50 caliber machine guns and AK-47s, often fired from behind earthen bunkered positions.[3] Though most cruising and patrolling was done at 8 to 10 knots, the boats could reach a top speed of 32 knots. If attacked the boats would accelerate out of harm's way, turn and then return as a group, firing as many of their .50 caliber machine guns as they could bring to bear as they powered past the ambush point, then returning back across as many times as needed to reduce the ambushers. Engagements were brief and violent, with the ambushers often slipping off into the undergrowth when the boats located the source of attack and began to concentrate their return fire. Casualties taken among the river crews were high. Casualties suffered among the Viet Cong were difficult to access, as they would take their dead and wounded away from the firefight. Discovering new graveyards was one of the few ways to confirm Viet Cong losses.[4]

The first Swift Boat to be lost during the war was PCF-4, which was lost to a mine in 1966. Three others were lost in rough seas, trying to re-enter the treacherous mouths of the Cua Viet River near the DMZ. PCF-41 was lost in a running gun battle with southern NLF guerrillas operating in South Vietnam in 1966. PCF-43 was lost to a rocket attack in 1969,[5] and PCFs 77, 14, and 76 were lost to heavy seas. Several other Swift Boats had been lost to river mines, but had been salvaged and either repaired or used for spare parts.

The Events of June 1968Edit

In June 1968, PCF-19 and PCF-12 were patrolling near the DMZ (17th parallel) when they were attacked by hovering aircraft at night time. Within minutes, PCF-19 had disappeared from an explosion, and PCF-12 commenced a running gun battle with its .50 caliber machine guns for well over an hour with those "hovering lights." During this battle, PCF-12 had been continuously radioing that they were under attack by unidentified aircraft, i.e. hovering aircraft. The response was a continuous one, "no friendly aircraft in the area". Further radio traffic informed PCF-12 that US Forces had suspended all flying operations within PCF-12's area, in order to isolate the problem; especially rotor-wing aircraft (helicopters).

However, the Swift Boat was still in contact (still engaged with the enemy). Hours elapsed, but still in darkness, US jet aircraft responded to PCF-12's firefight, but bypassed them and headed for the Australian destroyer HMAS Hobart and the heavy cruiser Boston, the U.S. jets fired rockets killing two Australian sailors, and slightly damaging the Hobart and the Boston. Parts of the recovered rockets had US data on them identifying them as American. The hovering aircraft had also been seen by US Marines on shore, near the DMZ, on the South side of the border. When all reports had been submitted, the attacks on the two allied warships were attributed to the US attacking fixed-wing aircraft (friendly fire), and also for attacking PCF-12, and destroying PCF-19.[6]

A primary complication, that helped to make the above conclusion, is that the battle between the Swift Boats and the unidentified hovering aircraft started between midnight and 0100 hours on 16 June, and the attacks (fratricide) on the Boston and Hobart occurred during the same time frame, only on the 17th of June. These were two separate dates, and, in reality, two separate incidents. When completed (the reports) both events had somehow been merged into one incident; again, fratricide. It had been theorized, by both officers and men (U.S. Army, USMC, USN) that the, "NVA helos were flying artillery...",[6] etc. to Tiger Island, located just off the North Vietnamese coast. However, it goes beyond theory, when official reports, such as OIC, PCF-12's Combat After Action Report dated "20 OCT 1967" (1968?) for "Market Time Patrol", "151130H JUN-161130H JUN 1968", mentions in part "...enemy held Tiger Island...possible base of operations for North Vietnamese military..." and "under constant air attack from all angles Helo...gunners ordered to fire the .50 caliber guns at any and all air contacts..."[6] There were more than enough declassified official reports that mention "enemy aircraft" to conclude that the loss of PCF-19 was due to North Vietnamese helicopters. It is important to note, however, that as of 2006, PCF-12 and PCF-19 were still carried by the US Navy as attacked/lost from friendly fire.[6]

In TrainingEdit

The most frequent training area for the Mare Island units was the marshland that forms the northern shoreline of San Francisco Bay. This area, now known as the Napa-Sonoma Marshes State Wildlife Area, was also used by U.S. Navy Reserve unit PBRs (Patrol Boat, River) up until 1995, when Mare Island was scheduled for Base Closure. During those years in which the Swifts and PBRs were operating, motorists traveling along Highway 37 from Vallejo, which passes Mare Island, to the Bay Area would often see the Riverine Boats making their way through the various sloughs of the current wildlife area. U.S. Naval Riverine Training is still authorized in the waters of the State Wildlife Area, and portions of the TV History Channel Series Gunboats of Vietnam, were filmed there.


  1. Symmes War on the Rivers p. 95
  2. Symmes War on the Rivers p. 148
  3. Symmes War on the Rivers p. 136
  4. Symmes War on the Rivers p. 173
  5. Symmes War on the Rivers pp. 120-122
  6. 6.0 6.1 6.2 6.3 Steffes, James (2005), Swift Boat Down: The real story of the sinking of PCF-19, Xlibris, ISBN 1-59926-612-1
  • Friedman, Norman U.S. Small Combatants: An Illustrated Design History, United States Naval Institute, 1987 ISBN 0870217135.
  • Steffes, James Swift Boat Down: The real story of the sinking of PCF-19, Xlibris, 2005 ISBN 1-59926-612-1
  • Symmes, Weymouth War on the Rivers: A Swift Boat Sailor's Chronicle of the Battle of the Mekong Delta Pictorial Histories Publishing Company, 2004. ISBN 1-57510-109-2

External linksEdit