Of Black Hulls, Buoys, and Grenades along the Mekong
While we’ve covered the Vietnam-era deployments of the U.S. Coast Guard’s 26 Point-class patrol boats (CGRON One) and the follow-on rotating mission of 31 blue water cutters with CGRON Three (the latter of which steamed 1.2 million miles, inspected 69,517 vessels and fired 77,036 5-inch shells ashore), there was a third series of unsung USCG deployments that still saw a good bit of action.
Between 1966 and 1972, at least four WWII-era 180-foot seagoing buoy tenders (USCGC Planetree, Ironwood, Basswood, and Blackhaw) were moved to Sangley Point, Philippines, from where they rotated to the waters around South Vietnam in 3-to-7-week stints, establishing a modern aids-to-navigation (ATON) system and training a motley collection of locals to keep tending them moving forward.
The Coast Guard Cutter Basswood works a buoy as busy Vietnamese fishermen travel to the open sea and their fishing grounds from Vung Tau harbor during her 1967 deployment. The cutter battled monsoon weather for a 30-day tour to establish and reservice sea aids-to-navigation dotting the 1,000-mile South Vietnamese coastline. USCG Historian’s Office photo
The 180-foot buoy tender USCGC Blackhaw (W390) in 1960, still with her circa 1943 3-inch mount behind her stack.
Blackhaw tending aids to navigation off Da Nang, Republic of Vietnam in September 1970, with RVN lighthouse service personnel aboard. Blackhaw spent 11 stints in Vietnamese waters while staged from the Philippines: 13 March- 6 May 1968; 24June-18JuIy 1968; 9 September-11 October 1968; 16 January- 4 March 1969; 16 April-3 May 1969; 16 June-3 July 1969; 24 October-7 December 1969; 23 April-18 May 1970; 24 October-10 November 1970; 13 January-7 March 1971; 25 April-17 May 1971.
While they carried a 3″/50 DP mount, Oerlikons, and depth charges when built, most of the 180s landed their topside armament during the 1950s, as it generally wasn’t needed to go that heavy while tending navigational aids stateside at the time.
This changed for the Southeast Asia-bound tenders, who added a pair of topside M2 .50 cal Brownings (later raised to eight!), as many as four M60 machine guns, and a serious small arms locker that included M1 Garands, M16s, M1911s, shotguns, spam cans of 10-gauge Very flares, depth charge markers, and grenades.
Lots of grenades.
Check out this 1970 ordnance draw from Sangley Point by Blackhaw:
The 7,000 rounds of .22LR are likely for recreational use, with the tender probably having a couple of rimfire pistols and rifles aboard for downtime target practice.
Working in the Vietnamese littoral, they came under enemy fire regularly and returned said fire. For example, in one incident in 1970, Blackhaw’s crew expended 132 grenades (!), 3,360 rounds of 5.56/.30 cal for rifles, 2,300 7.62 rounds for light machine guns, and 3,535 rounds .50 cal for heavy machine guns reacting to combat. Heady stuff for navigational aids guys!
Check out this deck log from a rocket encounter on Blackhaw while operating in conjunction with Navy Seawolf helicopters and PCFs.
Also, when anchored overnight within distance of shore, rifle-armed topside sentries typically dropped a grenade over the side every 20 minutes or so and/or fired off a Very signal to discourage enemy sappers from swimming out with limpet mines. Hence, the need for a pallet of hand grenades on a buoy tender.
More details on Blackhaw’s work, via a 1970 Proceedings article by LCDR Robert C. Powers, U. S. Navy, Former Logistics Plans and Requirements Officer, Staff, U. S. Naval Forces, Vietnam:
The basic plan was for the United States to provide material, technical advice, and funds to the Directorate of Navigation, who would provide buoy tender services. A staff study by Commander Coast Guard Activities Vietnam in April 1967 concluded that greater U. S. assistance was necessary in completing the desired improvements, and recommended full time use of a large buoy tender in Vietnam. USAID was to continue upgrading the Directorate of Navigation so that they could completely take over the aids to navigation mission by January 1969.
Coast Guard buoy tenders in the Pacific were reassigned, and the USCGC Blackhaw, (WLB-390) a 180-foot buoy tender, was employed full time for this task in January 1968. Her homeport was changed from Honolulu to Sangley Point in the Philippines. One officer and 14 enlisted men were added to the normal ship’s complement of six officers and 43 men. Six additional .50-caliber machine guns were installed, giving her a total of eight. Two 7.62-mm. machine guns were also added. The Blackhaw’s schedule was planned to provide about 40 days in-country per quarter, with no duties except for the job of Vietnam aids to navigation. In July 1968, the Joint Chiefs of Staff formalized this employment.
The Coast Guard has now installed and is operating 55 lighted buoys, 50 unlighted buoys, and 33 lighted structures in Vietnam. A small Coast Guard buoy depot has been established at Cam Ranh Bay, for in-country storage and maintenance of NavAid equipment. The Directorate of Navigation continues to operate those aids which were in place before Coast Guard involvement, but is not yet capable of relieving the Coast Guard in the maintenance of U. S. installed aids.
The aids to navigation detail remains in Saigon, attached to the Coast Guard Southeast Asia section. They schedule work for the Blackhaw and also repair light outages when the Blackhaw is not in the area.
Operation of a system of maritime aids to navigation in Vietnam is not the same as operating systems in the United States. Charts, for example, are poor, and accurately charted landmarks that may be used for buoy positioning are scarce. The channels, whether natural or dredged, are notoriously unstable. An example of this is the Cua Viet Entrance Channel Buoy 6. Established in 30 feet of water in October 1968, six months later the buoy became a shore light—high and dry. Enemy sappers have also been discovered and shot in the areas of moored buoy tenders. Viet Cong have stolen batteries from range lights. In Tan My, for instance, 50 batteries were lost in two months.
Several buoys are run down each month, usually resulting in a loss of lighting equipment. Within a representative four-month period, 40% of all unlighted buoys received damage as a result of collision, gunfire, and weather, and 70% of all lighted aids required extensive repair, recharge, and re-positioning. Before working on any buoy, a diver thoroughly inspects each buoy mooring for explosive charges.
Since active Coast Guard involvement in this task began, the maritime aids to navigation system in Vietnam has continued to improve. Harbormasters and pilots in all ports are happy with these improvements. Vietnamese personnel are on board the Blackhaw, while she is in-country, to become familiar with the system and maintenance methods.
The USCG turned over the ATON duties in South Vietnam to the locals on 31 December 1972, capping a forgotten footnote in the service’s history. As far as I can tell, none of the four tenders suffered any official combat casualties during their Vietnam service (with Agent Orange exposure being another matter).
Blackhaw earned a U.S. Navy Meritorious Unit Commendation as well as more Combat Ribbons than any other cutter.
She served in California waters until decommissioning in February 1993. Ship breakers stripped the former cutter of her valuable equipment, and the hulk was sunk as a target vessel. Nonetheless, she endures on the silver screen as she appears in the 1990 movie The Hunt for Red October as a Soviet icebreaker trailing the titular Typhoon-class SSBN during the opening sequence.