U.S. Coast Guard: Priorities for the Future–CSIS/USNI

The video above records an recent event, a “Maritime Security dialogue” presented by the Center for Strategic and International Studies (CSIS) and the United States Naval Institute (USNI) featuring Admiral Paul F. Zukunft, Commandant of the U.S. Coast Guard, for a discussion on the “U.S. Coast Guard’s future priorities.”

Despite the title, don’t expect a recitation of Coast Guard priorities. Most of the material is familiar, but there were a few interesting comments, including some that might be surprising. A number of things the Commandant said here made news.

  • That the NSCs could be made into frigates.
  • That the Polar Icebreaker would cost less than $1B
  • His support of transgender CG personnel.

I’ll give a quick outline of what was talked about. At the end I will rant a bit about some of my pet peeves.

The Commandant’s prepared statement is relatively short beginning at time 2m45s and ending about 11m.

6m00 In our listing of missions, the Commandant said Defense Operations should be listed first. He noted that there are 20 ships chopped to Combatant Commanders including eleven  ships operating under SOUTHCOM.

Q&A begins at 11:00.

16m20s The Commandant noted there is a Chinese ship rider on a USCG cutter off Japan and that Coast Guard aircraft are flying out of Japan.

17m30s Boarder protection/drug interdiction

20m Called the OPCs “light frigates”

22m As for priorities the Commandant noted a need to invest in ISR and Cyber

23m Cyber threat.

24m Expect return to sea duty because of length of training.

26m30s “Demise of the cutterman”/Human Capital Plan–fewer moves–removed the stigma of geographic stability

29m25s Highest percentage of retention of all services–40% of enlisted and 50% of officers will still be in the service after 20 years

30m Law of the Sea. Extended continental shelf in the Arctic.

32m30s Need for presence in the Arctic.

36m ISR, 38m15s Firescout. An interesting side note was that the Commandant seemed to quash any possibility of using the MQ-8 Firescout. He noted when they deployed on a cutter 20 people came with the system.  He called it unoccupied but not unmanned.

40m Icebreakers

43m30s Comments on transgender members

45m15s Icebreakers–will drive the price down below $1B.

47m NSC as frigate–no conversations with the Navy about this. Performance of Hamilton.

49m50s Count the NSCs toward the 355 ship Navy.

50m30s Illegal migration and virulent infectious disease

53m35s CG training teams in the Philippines and Vietnam to provide competency to operate platforms to be provided by Japan. Two patrol boats going to Costa Rica. Other efforts to build capacity.

56m DHS is the right place for the CG.

The Commandant touched on a couple of my pet peeves, specifically

  • He called the OPCs “Light Frigates,” so why aren’t they designated that way? WMSM and WMSL are just wrong in too many ways.  Give our ships a designation our partners and politicians can understand. A WLB is a cutter and also a buoy tender. The OPC can be both a cutter and a light frigate. I have suggested WPF. Maybe WFF for the Bertholfs and WFL for the Offshore Patrol Cutters. If we want to be thought of as a military service, we need to start using designations that will be seen and understood as military.
  • He mentioned the possibility of including the Bertholfs in the 355 ship fleet total. Coast Guard combatants should be included when the country counts its fleet. No, the cutters are not aircraft carriers or destroyers, but the current fleet of about 275 ships includes about 70 ships that have no weapons larger than a .50 cal. These include eleven MCM ships and about 60 ships manned by civilian crews such as tugs, high speed transports, salvage ships, underway replenishment ships, and surveillance ships. Counting the Cutters as part of the National Fleet would raise  our profile as a military service. The Navy might not like it, but it does give a better idea of our actually available assets for wartime, which is the point of such a listing.



Interview: Adm. Paul Zukunft demands Coast Guard respect–Defense News

DefenseNews had an interview with the Commandant. You can read it here. I will not repeat the Commandant’s responses here, but I will repeat one of the questions and add my own thoughts.

Admiral, you have said that the Coast Guard’s identity as an armed service is forgotten. Can you tell me what you mean by that?

The Commandant talks here about budget, but I think this starts with self image. We do SAR. We rescue sea turtles. Armed services are first and foremost ARMED. We are by law a military service, but we are currently inadequately armed for even our peacetime counter terrorism, DHS mission. We are less capable of forcibly stopping a ship than we were 90 years ago.

Do our people know what their role will be if there is a major conflict with the Chinese or Russians? You can bet Navy and Marine Personnel have a pretty good idea of their roles.

We have had a quarter century hiatus in a mono-polar world where no one could challenge American seapower. That is changing rapidly and it is time for the Coast Guard to see itself in a new light. Just as the nation has benefited from having two land forces (Army and Marines), it can benefit from having two sea forces. The Coast Guard is a substantial naval force. Certainly we will not replace the Navy’s sophisticated systems, but there is a need for a high low mix and the marginal cost of adding capability to Coast Guard vessels that are going to be built anyway is very small.

We are currently in an unrecognized naval arms race with China. It is time to give the Coast Guard back the ASW and ASuW capabilities it was building before the collapse of the Soviet Union.

When I reported to the academy in 1965, it had a gun lab, and we were taught ASW (badly) during swab summer. The Coast Guard had 36 ships equipped with sonar, ASW torpedoes and 5″ guns. The ships were old (not as old as now), but we were building a new fleet of 36 Hamilton Class WHECs equipped with a better sonar in addition to torpedoes and a 5″ gun. Being armed did not stop us from doing SAR, fisheries, or aids to navigation.

At that time (1965) in terms of personnel, the US Navy was about 25 times larger than the Coast Guard and had 287 cruisers, destroyers, and frigates. Now it is only eight times as large as the Coast Guard and has only 85 ASW equipped surface ships. We also had a powerful naval ally in Europe in the form of the Royal Navy. Now the Coast Guard is supplying personnel to the Royal Navy and in terms of personnel the Coast Guard is larger than the Royal Navy or the French Navy. Equipping our planned 33 to 35 large cutters as true surface combattants could make a real difference.

Even if we never go to war, preparation can make us better at our peacetime roles. Drug interdiction, migrant interdiction, and even SAR benefit from military grade ISR and C4I. Recognition of naval capabilities in the Coast Guard may justify additional resorces that have dual use for peacetime missions. Its a win-win.


Bit of Intel from the UK

The German Navy blog, Marine Forum, reports:

21 May, UNITED KINGDOM, Special Boat Service and Royal Navy commandos have been conducting covert underwater inspections of tankers transporting gas from the Middle East to Britain … growing fears that Al Qaeda or Islamic State terrorists might attach explosives to ships in the Middle East – and detonate them when they reach the UK.

Hearing: Coast Guard Requirements, Priorities, and Future Acquisition Plans (FY-2018)


May 18, the Commandant, Admiral Paul F. Zukunft, addressed the House Appropriations Homeland Security Subcommittee. The recorded testimony is above. It is fairly long (1h40m). The Commandant’s initial statement, following the introductions, begins at 8m40s and ends approximately minute 14.

The administration’s FY 2018 budget request was not available, but the Commandant was there to discuss future priorities, requirements, and programs. The Department Secretary, General Kelly, is expected to address the Subcommittee on May 24 at 3PM Eastern.

I will just mention a few of the items I thought significant.

Admiral Zukunft noted that Huntington Ingalls has begun cutting steel for NSC #9. Questioned about NSC#10, he said, if it were funded, the Coast Guard would of course use it, but that the Offshore Patrol Cutter (OPC) is the Coast Guard’s #1 priority. His response, that another NSC would have an effect on long-range operating cost, seemed to suggest anticipated significantly lower operating costs for the OPC. Significantly, there has been no mention of reducing the OPC program by one ship to offset the addition of NSC #9. (There is already a strong push to build more NSCs, a bill to authorized a multi-year buy of three more.)

He contended that the Coast Guard has taken a harder hit, due to budget restrictions, than other armed services and would need 5% annual growth and at least $2B annually for Acquisitions, Construction, and Improvements (AC&I). Later he stated that this annual AC&I appropriation would included about $300M annually for shore facilities. He pointed to a need to restore 1100 Reserve Billets and add 5,000 active duty military billets while retaining current levels of Civilian staff.

Apparently the FY2918 budget will begin a program to replace 35 Inland tenders at an estimated cost of approximately $25M each ($875M total). (Even if, in the unlikely event, this program were funded in only five years, that would only average $175M/year, so it is not a big program, but one that should have begun at least a decade ago.)

Cyber security for ports was discussed. The Commandant sees the Coast Guard role as decimating best practices, rather than imposing regulation. We now have a cyber program of record–still very small, two CG Academy graduates going directly into the program. The fact that two billets is worth mentioning, is probably the best indication of how really small the program is. A much smaller pre-World War II Coast Guard probably had more people working on breaking German and Japanese codes. 

Marine Inspection was addressed. The Commandant noted the increased demand for Inspections because 6,000 tugs have been added to inspection program. He noted a need for more stringent oversight of 3rd party inspectors, who in some cases have not been as meticulous as they should have been. He also noted that the US flag merchant fleet, notably the MSC’s Afloat Prepositioning Fleet, will need replacement, which will also raise demand for marine inspectors.

The Commandant also voiced his support for the Jones Act. He noted, we only have three shipyards building Jones Act ships in the US, and their loss would be short-sighted.

There was much discussion about the Arctic and the Icebreaker Fleet. Looks like follow-on funding for icebreaker program (at least after the first) will have to come from CG AC&I rather than the Navy budget. This may be difficult, but it is the way it should be. The chair of committee expressed his reservations about attempting to fund such big-ticket items through the DHS budget. The Commandant stated that the Coast Guard is still considering the acquisition of the commercial Icebreaker Aiviq (but apparently they are doing it very slowly–the chairman of the committee seemed a bit irritated about this).

The committee members seemed to latch onto the idea that the USCG, rather than the Navy, would be responsible for enforcing US sovereignty in the Arctic (which by US definition includes the Aleutians), and seemed to be asking if the Coast Guard was prepared to fight the Russians and/or Chinese in the Arctic. The Commandant suggested instead, that our role was to provide presence in the pre-conflict phase in order assert US sovereignty. He acknowledged that the National Security Cutters are only armed defensively and are not suitable for conventional naval warfare against an enemy combatant.

The Commandant acknowledged that, at some point it may be desirable to arm Polar Icebreakers, meaning they should be built with space, weight, and power reservations for additional weapons.

(I am all for keeping open the option of arming our icebreakers, so that they can defend themselves and do their part, if there is a conflict in a polar region, but there did not seem to be recognition among the Congression Representatives, that an Arctic conflict is most likely to be determined by submarines and aircraft. The icebreakers’ role is likely to be primarily logistical.)

The Commandant apparently does expect that there may be disagreements with regard to the extent of the US authority over certain areas of the Arctic.

In discussing the need for land based Unmanned Air Systems, there was a curious note at minute 40 about go-fast boats going south. Where are they going?

Alien Migrant Interdiction (AMIO). We have gone for seven weeks without a single Cuban Migrant being interdicted. This is because of the end of Wet Foot/Dry Foot Policy. This has allowed reallocation of resources to drug interdiction South of Cuba and human trafficking from the Bahamas

A Congressional Representative, from Texas pointed out there is no CG presence on the Rio Grande River, in spite of it being an international waterway. There was no mention of it, but perhaps he was thinking of the Falcon Lake incident in 2010 when an American was allegedly shot in the head by Mexican drug runners. Maybe something we should reconsider.

The Commandant promised the CG would have an unfunded priority list for FY2018.

ISIS Threat to Russian Ships in Turkish Straits

File:Latrans-Turkey location Marmara Region.svg

Illustration: Turkey with the Straits and Sea of Marmara area in red, by “The Emirr.” Dardanelles to West of the Sea of Marmara and Bosphorus to the East. 

Following from the German Navy blog, Marine Forum, 16 May,

“After Turkish intelligence learned of Islamic State plans for attacks on Russian warships from ashore, Turkish authorities have beefed up security along the Turkish Straits and augmented escorts by Turkish Coast Guard.”

A number of the Russian Navy transits carry supplies to the Syrian Government Forces and Russian forces operating in Syria.

Ports, Waterways, and Coastal Security–Russian Style

NavyRecognition is reporting a Project 21980 Grachonok-class anti-commando boat of the Black Sea Fleet, the Yunarmeyets Kryma, has joined the Russian Navy’s standing naval force in the Mediterranean (Presumably in Syria).

The Yunarmeyets Kryma is a special boat built by the Zelenodolsk Shipyard in 2014. The Vympel Design Bureau in Nizhny Novgorod had developed the class to guard water areas and fight enemy naval commandos in the waters of naval bases and on close approaches to them. The boats in the class carry heavy machineguns, antidiver grenade launchers and man-portable air defense systems. Their radio electronics allow searching for underwater objects – both static and moving – while their diving system allows several divers to dive simultaneously.

It looks like a WPB so I looked up the class. They are 138 tons, 102 ft (31 m) in length, 23 knots, and a crew of eight. The Russians have built twelve and are building ten more.

Described as being anti-saboteur and anti-commando boats these are in intended for “force protection” which is included in the Coast Guard’s Ports, Waterways, and Coastal Security mission (PWCS). It is also one of the missions of the new US Navy MK VI patrol boat. We have detachments at Bangor and Kings Bay to protect Fleet Ballistic Missile subs while in transit that also perform this function.

Despite the similarities in mission, the Russian boat is armed and equipped much differently from their USN and USCG counterparts. It has a couple of sonars. In addition to a 14.5 mm (.60 cal.) machine gun, they have point defense anti-air missiles. Defense against swimmers is apparently much on their mind. They have two anti-swimmer weapon systems, the DP-64 a shoulder fired mini-depth charge thrower and the DP-65, a ten barrel, automated, sonar controlled mini-depth charge thrower.


DP-64 anti-swimmer grenade launcher. Artist: Jason Biggs

“The 55mm DP-65 remotely controlled…grenade launching system is designed for protection of ships against attacks of underwater combat swimmers at external roadstead open anchor stops and bases, for protection against attacks of underwater combat swimmers at water-development works, sea platforms and other important sea and coastal installations.”

The US had a lot of trouble with Viet Cong combat swimmers during the Vietnam war. They even manage to sink a small WWII built aircraft carrier (CVE) being used as an aircraft transport. It is unclear how well prepared we are for this type of attack now.

My Unfunded Priority List

An earlier post reported a plea by Representative Duncan Hunter, Chair of the Transportation Subcommittee on Coast Guard and Maritime Transportation, for the Coast Guard to provide an unfunded priority list to include six icebreakers and unmanned Air System.

Thought perhaps I would list my own “unfunded priorities.” These are not in any particular order.


Icebreakers: We have a documented requirement for three heavy and three medium icebreakers, certainly they should be on the list. Additionally they should be designed with the ability to be upgraded to wartime role. Specifically they should have provision for adding defensive systems similar to those on the LPD–a pair of SeaRAM and a pair of gun systems, either Mk46 mounts or Mk38 mod 2/3s. We might want the guns permanently installed on at least on the medium icebreakers for the law enforcement mission. Additionally they should have provision for supporting containerized mission modules like those developed for the LCS and lab/storage space identified that might be converted to magazine space to support armed helicopters.

110225-N-RC734-011 PACIFIC OCEAN (Feb. 25, 2011) Guy Mcallister, from Insitu Group, performs maintenance on the Scan Eagle unmanned aerial vehicle (UAV) aboard the amphibious dock landing ship USS Comstock (LSD 45). Scan Eagle is a runway independent, long-endurance, UAV system designed to provide multiple surveillance, reconnaissance data, and battlefield damage assessment missions. Comstock is part of the Boxer Amphibious Ready Group, which is underway in the U.S. 7th Fleet area of responsibility during a western Pacific deployment. (U.S. Navy photo by Mass Communication Specialist 2nd Class Joseph M. Buliavac/Released)

PACIFIC OCEAN (Feb. 25, 2011) Guy Mcallister, from Insitu Group, performs maintenance on the Scan Eagle unmanned aerial vehicle (UAV) aboard the amphibious dock landing ship USS Comstock (LSD 45). Scan Eagle is a runway independent, long-endurance, UAV system designed to provide multiple surveillance, reconnaissance data, and battlefield damage assessment missions. Comstock is part of the Boxer Amphibious Ready Group, which is underway in the U.S. 7th Fleet area of responsibility during a western Pacific deployment. (U.S. Navy photo by Mass Communication Specialist 2nd Class Joseph M. Buliavac/Released)

Unmanned Air Systems (UAS): We seem to be making progress on deploying UAS for the Bertholf class NSCs which will logically be extended to the Offshore Patrol Cutters. So far we see very little progress on land based UAS. This may be because use of the Navy’s BAMS system is anticipated. At any rate, we will need a land based UAS or access to the information from one to provide Maritime Domain Awareness. We also need to start looking at putting UAS on the Webber class. They should be capable of handling ScanEagle sized UAS.

File:USCGC Bluebell - 2015 Rose Festival Portland, OR.jpg

Photo: The Coast Guard Cutter Bluebell sits moored along the Willamette River waterfront in Portland, Ore., June 4, 2015. The Bluebell, which celebrated its 70th anniversary this year, is one of many ships participating in the 100th year of the Portland Rose Festival. (U.S. Coast Guard photo by Chief Petty Officer David Mosley.)

Recapitalize the Inland Tender Fleet: This is long overdue. The program was supposed to begin in 2009, but so far, no tangible results. It seems to have been hanging fire for way too long.

Expand the Program of Record to the FMA-1 level: The Fleet Mix Study identified additional assets required to meet the Coast Guard’s statutory obligations identifying four asset levels above those planned in the program of record. Lets move at least to first increment.

Alternative Fleet Mix Asset Quantities

————–POR       FMA-1      FMA-2      FMA-3       FMA-4
NSC                8             9                 9                 9                  9
OPC              25           32               43                50               57
FRC              58           63               75                80               91
HC-130         22            32               35                44               44
HC-144A       36            37               38                40               65
H-60              42            80               86                99             106
H-65             102         140             159              188            223
UAS-LB           4            19                21                21              22
UAS-CB        42            15                19               19               19

At the very least, looks like we need to add some medium range search aircraft (C-27J or HC-144).

Increase Endurance of Webber Class Cutters: The Webber class could be more useful if the endurance were extended beyond five days (currently the same as the 87 cutters, which have only one-third the range). We needed to look into changes that would allow an endurance of ten days to two weeks. They already have the fuel for it.



Ship Stopper (Light Weight Homing Torpedo): Develop a system to forcibly stop even the largest merchant ships by disabling their propulsion, that can be mounted on our patrol boats. A torpedo seems the most likely solution. Without such a system, there is a huge hole in our Ports, Waterways, and Coastal Security mission.


Photo: SeaGriffin Launcher

Counter to Small High Speed Craft (Small Guided Weapon): Identify and fit weapons to WPB and larger vessels that are capable of reliably stopping or destroying small fast boats that may be used as fast inshore attack craft and suicide or remote-controlled unmanned explosive motor boats. These weapons must also limit the possibility of collateral damage. Small missiles like SeaGriffin or Hellfire appear likely solutions.

40 mm case telescoped gun (bottom) compared to conventional guns.

40 mm case telescoped gun (bottom) compared to conventional guns.

Improved Gun–Penetration, Range, and Accuracy: The .50 cal. and 25mm guns we have on our WPBs and WPCs have serious limitations in their ability to reach their targets from outside the range of weapons terrorist adversaries might improvise for use against the cutters. They have limited ability to reach the vitals of medium to large merchant vessels, and their accuracy increases the possibility of collateral damage and decreases their probability of success. 30, 35, and 40 mm replacements for the 25 mm in our Mk38 mod2 mounts are readily available.

Laser Designator: Provide each station, WPB, and WPC with a hand-held laser designator to allow them to designate targets for our DOD partners.


Vessel Wartime Upgrades: Develop plans for a range of options to upgrade Coast Guard assets for an extended conflict against a near peer.


The Mk38 and Ballistics and Weapons Effectiveness Lessons from Pursuit of the Graf Spee, Part 2


Part one recounted an engagement in 1939 between the “pocket battleship” (heavy cruiser) Admiral Graf Spee and three smaller British cruisers. This part will discuss the implications.

So what does a 77 year old Naval battle have to do with the Coast Guard’s ability to stop a terrorist attack using a medium to large ship?

As I said in part one (in a different order), I think it shows:

  • It is very difficult to sink a ship by gunfire alone.
  • Ships’ structure provide a degree of protection that makes it difficult to comprehensively target the crew of a ship without sinking the ship.
  • It is difficult to forcibly stop a ship with gunfire alone.
  • In comparing guns, at any given range, the longer ranged weapon generally enjoys an advantage in accuracy.
  • You can run out of ammunition before you accomplish your mission. The depth of your magazine may be important.

What do we have to oppose this type of attack?:

We don’t really have a lot of options.

If we have enough warning, say 24 hours, we can ask for help, but as far as I can tell there is no system of rapid response to surface threats. (When 9/11 occurred, we had no system for rapid response to air threat.) Unless we have absolute proof that the vessel in question is hostile, the Coast Guard would almost certainly have to intercept the vessel to determine hostile intent before it could be attacked. If the threat is a 20 knot ship detected 200 miles from its target we will have only ten hours to deal with the threat, and we are likely to be considerably less.

We have one Maritime Security Response Team (MSRT) on each coast, but to mobilize them, brief, organize, transport, and then get them to where we want them to act may take considerable time. Additionally while they might be effective in retaking a hijacked merchant ship, where there are relatively few hostiles who also have to control the crew, attempting an opposed boarding of a ship crewed by armed terrorist as a first step toward stopping an attack may be suicidal. If we have time to get them into place then perhaps we would also have time to get help from other services.

I think it more likely we will have at best a few hours to deal with the threat and we will have to use forces already in the area. I’ve made suggestions about additional equipment we might use to address this threat (here and here), but this time I will discuss tactics using what we have, or plan to have, and limit equipment suggestions to minimal upgrades and choice of ammunition.

While I doubt we will have cutters armed with 57mm Mk110s or 76mm Mk75s, on scene when required, we will discuss their utility and limitations. The Mk38 seems to be the key system, widely available and potentially capable, if the right ammunition is available. Other systems, .50 caliber and smaller, appear ineffective in stopping medium to large ships, but they may have their uses.

It is very difficult to sink a ship by gunfire alone:

Each of the Graf Spee’s 11.1″ projectile weighed 125 times the weight of a 57mm shell or roughly the weight of all the projectiles in a 57mm Mk110 gun mount’s 120 round automatic feed system.

Graf Spee was hit 20 times, three times by 8″ and 17 times by 6″ for a total of 2,672 pounds of projectiles. That is roughly the equivalent of being hit 500 times by a 57mm. From a distance, other than the burned out scout plane she carried, it would have been difficult to tell that she had been hurt.

Exeter was hit at least seven times excluding damaging near misses. That was 4,627 pounds of projectiles, a weight, I believe, almost equal to the total weight of all the 57mm projectiles allowed on a National Security Cutter (about 5,300 pounds assuming 1,000 rounds). While heavily damaged, Exeter was still capable of making 18 knots and completing the approximately 1,000 nautical mile journey to the Falklands.

Neither of these ships would be considered large by current standards. We can conclude, we are unlikely to sink a medium to large merchant ship with any weapon in the Coast Guard inventory.

Ships’ structure can provide a degree of protection that makes it difficult to comprehensively target the crew of a ship without sinking the ship.

Personnel Casualties were relatively light. Out of the approximately 3,000 men on the four ships, there were only 108 killed and 88 wounded.

  • Commonwealth: 72 dead (Achilles 4, Ajax 7, Exeter 61), 28 wounded
  • Germans: 36 dead, 60 wounded

As severely damaged as Exeter was, less than one in ten of the crew was killed. Unless terrorists choose to expose themselves, gunfire, from either cutters or airborne use of force equipped helicopters, is unlikely to allow us kill enough terrorists to stop an attempt to use a medium or large ship to make an attack.

Can We Immobilize the Target?: 

None of the four ships were immobilized.

Of the approximately 30 hits, only one hit a main machinery space and it appears this was not because armor kept rounds out. It was simply that the amount of machinery space above the water line is a very small percentage of the total exposed area.

The single projectile that entered a machinery space was an armor-piercing 8″ round, and it wrecked the Graf Spee’s fuel oil purifier.  That made it virtually impossible for the ship to make it back to Germany without having work done in port over an extended period. That would have allowed Britain to guarantee that Graf Spee would never escape, but it did not stop her from transiting at full speed for about 14 hours.

A modern merchant vessel diesel engine. 

The task of stopping a ship by gunfire actually may have become more difficult because of the size and toughness of modern large diesel power plants, and because the large size of modern vessels puts more of the engine below the waterline and provides more space between the ships sides and the propulsion machinery.

The ship featured in the video above is no longer particularly large. The new Panama Canal locks needed to be wider and deeper than the old ones to accommodate the larger ships that have now become common. The locks are now 180 feet (vs 110 feet) wide and 60 feet (vs. 42 feet) deep. Many ships now have sufficient draft such that the 40 foot tall engine in video could be entirely below the water line.

Fuel consumption for the engine in the video above was reported twice, first as 328 tons per day and later as 400 tons per day. If we assume only 300 tons per day, that is 12.5 tons per hour or 417 pounds /minute or about 7 pounds per second.

The explosions going off in this type of engine every second are more powerful than the explosion of a 57mm shell. 

There is less than a pound of explosive in a 57mm projectile. 1 pound of TNT has 13.4 megajoules of energy. We may assume a more powerful explosive in the Mk110 projectiles, perhaps 20 megajoules. One gallon (about 7.1 pounds) of diesel (the amount consumed in one second) equals 146.5 megajoules.

The 57mm gun does not have a true armor-piercing round. The current 3P fuse has a semi-armor piercing function which I presume is similar to the previous semi-armor piercing (SAP) round, “The SAP round had a delayed action fuze which allowed the round to penetrate about 2 cm (0.8 inches) of armor and then explode after traveling a further 2 m (6 feet).” If that is the case, first it is uncertain that the round will penetrate, since the plating on large ships can considerably exceed 2 cm, but assuming it did, an explosion two meters inside the hull would still be a long way from a very tough engine.

The 76mm Mk75 is the most powerful gun in the Coast Guard inventory, but we have fewer of them every year, although it looks like we will not see the last of those on the 270s until 2034. It is still a relatively small projectile at about 14 pounds. Like the 57mm there is no true armor-piercing round for this weapon. Like the 57mm its projectile would likely explode shortly after penetrating the hull, rather than on or in the engine. The 57 and 76 mm guns might have more success against the steering gear, but that will also be very robustly built on any large ship, and hitting it will require great accuracy, suggesting a close approach.

The Mk38 25 mm, with a maximum shell weight of 1.1 pound or less, might be assumed to be even less likely to do damage, but they do have an option for an armor-piercing fin stabilized discarding sabot round (APFSDS) (pdf). It is intended for use against lightly armored vehicles like Armored Personnel Carriers. It may not be commonly available for the Mk38 (the Navy thinks of the Mk38 exclusively as a counter to small craft), but the APFSDS round is in the Navy system for use by Marine LAV-25 Light Armored Vehicle. It fires a 98 gram (3.5 oz) Solid Tungsten Penetrator at a very high velocity, 1390 m/sec (4560 ft/sec).

25MM TUNGSTEN APFSDS-T Armor Piercing Fin Stabilized Discarding Sabot-Trace

Armor Piercing Fin Stabilized Discarding Sabot-Trace

The .50 caliber, 7.62 and 5.56 mm weapons are simply too light to make much impression on a medium or large ship. The only other CG gun with a possibility of forcibly stopping one of these vessels is the Phalanx 20mm Close In Weapons System (CIWS). This system uses a discarding sabot round 12.7mm in diameter Solid Tungsten Penetrator with a 3,650 fps (1,113 mps) muzzle velocity. The Phalanx is only found only on WHECs and NSCs, so they will soon be home ported only in Charleston, Alameda, and Honolulu and it is unlikely these ships will be available to respond.

If we do detect a terrorist attack, the only likely Coast Guard counter to it, is likely to be equipped with a Mk38 mount. We are not going to sink a medium or large ship with the Mk38, but we might be able to disable it, if we can accurately penetrate both the ship’s hull and the ship’s engines or disable the steering.

In comparing guns, at any given range, the longer ranged weapon generally enjoys an advantage in accuracy.

I started thinking about the results of the Battle of River Plate after reading this pdf, Offshore Patrol Cutter (OPC) SUW Self-Protection Secondary Battery Study (which compared one and two-gun solutions using .50 cal., 25mm, and 30mm) and writing a post about a possible 40mm alternative for the Mk38 gun mount currently used on the Webber class WPCs and planned for the Offshore Patrol Cutter. It occurred to me that everyone may not understand my strong preference, when considering guns, for the longest ranged weapon available, even if I don’t expect it to be used at extreme ranges.

It is not just the potential of longer range, or the fact that the projectile is probably larger and more effective. It is also the fact that, all other factors being equal, the longer ranged weapon is also almost always more accurate.

Comparing any two weapons, fired at a target at the same range, the longer range weapon will generally fly a flatter trajectory (a more direct path) and have a shorter time of flight, meaning it will be effected less by uncertainties of environment and the actions of the target between firing and impact.

In the battle we see three gun with different ranges and can compare their accuracy. If we look at the British 6″ guns as a base line, how did the weapons compare?

The British 6″ gun had a maximum range of  24,500 yards (22,400 m). They got hits 0.82% of the time.

The British 8″ gun had a maximum range of 30,650 yards (28,030 m), 25% greater range, got hits 1.55% of the time, making them 89% more accurate than the contemporary 6″ guns.

The German 11.1″ had a maximum range of 39,890 yards (36,475 m), with 63% greater range than the 6″ guns, got hits 2.4% of the time, making them almost three times as accurate as the 6″ guns at the ranges the battle was fought (193% more accurate).

While it might be argued that the Graf Spee benefitted from superior fire control, the same cannot be said for the Exeter’s 8″ guns, that for most of the engagement were fired under local control. Additionally it appears that the light cruisers’ director controls were at least as sophisticated as that on Exeter. It appears the greater accuracy is due to the flatter trajectory and shorter time of flight of the longer ranged guns.

40 mm case telescoped gun (bottom) compared to conventional guns.

40 mm case telescoped gun (bottom) compared to conventional guns.

There are at least four different gun calibers that can be mounted on the Mk38 gun mount, 25, 30, 35, and 40mm. If we have the opportunity to upgrade the Mk38s to higher caliber weapons, we should take it, not just for the greater effectiveness of the projectile but also for the likely greater accuracy and effective range.




Case Telescoped 40 mm ammunition

Case Telescoped 40 mm ammunition

Making the Best of the Mk38

“No captain can do very wrong if he places his ship alongside that of the enemy.”–Horatio Nelson

When I looked at this problem earlier, I suggested that we should have systems that could disable a ship at ranges greater than 4,000 yards, so that weapons on the terrorist controlled vessel could not target specific systems on the defending cutter. With what we have now, we don’t really have that option. We are going to need to get a lot closer.

Not only is the effective range of the Mk38 less than 4,000 yards, we will need to get closer to increase accuracy to target specific parts of the terrorist vessel, and close the range to maximize the kinetic energy of the rounds.

If we are to have any chance of stopping a medium to large ship making a terrorist attack, we need to do what the British did. We need a team approach. We need to gang up on it.

The only ships we have that might have a chance are those with 25mm and larger weapons. There are relatively few of those. They would be the primary shooters. Hopefully you would have more than one to respond, but in many cases, perhaps most, there would be only one.

We can still use less capable units to take pressure off the primary shooter. These supporting units equipped only with .50 caliber and smaller weapons might be used to target the bridge, but their primary function should be to target any weapons that might endanger the more capable cutter(s). 

Targeting the bridge is relatively simple, but if the terrorists plan properly they will not need to navigate from the bridge. They can use an autopilot or steer from after steering.

As we approach we will want to establish hostile intent as early as possible, preferably without putting a boarding party aboard that might become hostages.

We can demand that the vessel stop or change course away from the endangered potential target. The quickest way to do that might be with an Airborne Use of Force helicopter. Other supporting units might also be sent ahead of the primary shooter to attempt to stop or turn the suspect vessel.

After establishing hostile intent, supporting units should, if possible, precede the primary shooter and engage the threat with the idea of suppressing any weapons the vessel might employ against the cutters.

As it approached its target, before attempting to disable it, the primary shooter should probably put a few rounds into the bow of the target, in case it has been loaded with explosives.

Because the supporting units will need to stay out of the line of fire between the primary shooter and terrorists’ vessel, and because projectile will lose the minimum amount of kinetic energy if it strike normal to the target’s side, the primary shooter should move to a position on beam of the threatening vessel, while supporting units should be both forward and aft of the primary shooter’s line of fire, ready to engage any attempt to return fire.

If the supporting units include a unit with only one machine gun on the bow, like a Response Boat, Medium (RB-M) and a unit with machine guns both fore and aft, like an 87 foot WPB, the WPB should be positioned toward the bow of the target, so that it can parallel the target and still have weapons on target while the unit (RB-M) with only gun on the bow, can keep its weapon on target.

An airborne use of force helicopter could also be very useful as a supporting unit, taking out any terrorist who appeared on deck and keeping an eye out for their activities on the disengaged side of the vessel.

At some point the primary shooter is going to have to close alongside, so that it can shoot through the hull near the waterline, down and into the engine room below the waterline. The supporting units should get there first, shoot up the bridge, attempt to draw fire and suppress any return fire.

When the primary shooter comes alongside ready to attempt to disable the terrorist vessel it will need a lot of ammunition so it will need to exercise fire discipline during the approach.

If we are unable to disable the engine(s) or steering, as a last ditch effort, we can attempt to push the vessel into shoal water and run it aground. This would of course make the cutters easy targets for grenades and RPGs.


The approach outlined above implies a desperate fight, with no guarantee of success. If the terrorists manage to knock out the few (or one) weapon capable of stopping them, we might have no chance of success.

This is not the kind of fight the Coast Guard should want. It puts our people, our mission, and the people we are supposed to protect in danger. Right now there is no assurance that 25mm can even do the job.

We really ought to do better.

The Future:

I would hope the Coast Guard would do some testing to find out if we have the weapons we need to stop the full range of possible maritime terrorist attacks.

That should help us pick the right ammunition. We really need to make sure we have the right types. of ammunition. 

If tests show we cannot disable the largest ships, we need to insist that get weapons that can, and they may not be standard US Navy weapons.

Alternately, we need to establish means to have other services deploy anti-ship weapons on short notice. (Coast Defense is still officially an Army mission.)

We noted earlier that a new Mk38 mod3 mount is on the way.  It will have much more ammunition on the mount. While the mount appears designed for a 30mm gun, it appears we will be getting them equipped with 25mm guns. More ammunition is good, but a larger weapon would be better.

Guns may not be the answer, but any upgrade we can get in the caliber of the gun on the mount will permit it to be more effective against progressively larger ships and at longer range.

In the not too distant future we will need to start replacing the 87 foot Marine Protector class WPBs. The oldest are already 18 years old. As soon as the last Webber class is funded, we need to start funding 87 footer preplacements. Hopefully we will see fit to arm these vessels for this mission.



Brookings Institute–A conversation with Commandant of the U.S. Coast Guard Admiral Paul F. Zukunft

Another video, this one almost an hour.