Mark VI patrol boat

Mark VI patrol boat
Chief Boatswain's Mate Nelson Doromal Jr · Public domain · source
Shipname	Mark VI patrol boat
Class	Mark VI patrol boat
Builder	United States
Built	2015–2018
In service	2015–present
Displacement	approx. 72 tonnes
Length	85 ft (26 m)
Beam	22 ft (6.7 m)
Draught	5 ft (1.5 m)
Propulsion	waterjets
Speed	35+ kn
Complement	10–12
Sensors	surface search radar, EO/IR, sonar (optional)
Armament	1× 25 mm chain gun, 4× remote weapon stations, 2× 0.50 cal MGs

Mark VI patrol boat The Mark VI patrol boat is a high-speed, coastal and littoral patrol craft developed for the United States Navy to perform interdiction, escort, and security missions. Designed and constructed by private shipbuilders under Navy contracts, the Mark VI combined high speed, extended range, and modular mission payloads to support United States Central Command and United States Sixth Fleet operations. The class entered service in the mid-2010s and was allocated to riverine, special operations support, and naval expeditionary forces.

Design and development

Development of the Mark VI was driven by requirements from Naval Expeditionary Combat Command and Office of Naval Research initiatives to provide small combatants for Operation Inherent Resolve-era littoral needs. Prime contractors included Safe Boats International and Austal USA partners under Navy program offices, linked to acquisition oversight by the Program Executive Office (PEO) Ships. The design incorporated lessons from the Mark V Special Operations Craft, Riverine Command Boat, and Patrol Coastal (PC) ship programs to achieve signature reduction, seakeeping, and extended transit ranges for Carrier Strike Group escort and Naval Special Warfare Command support. Prototype testing occurred at Naval Surface Warfare Center facilities and at private yards in Washington (state) and Alabama.

Specifications

The Mark VI measured approximately 85 feet overall with a beam near 22 feet and shallow draft suited to littoral waters, enabling operations in straits and river mouths such as the Strait of Hormuz and the Persian Gulf. Displacement approached 72 metric tons with a crew complement tailored to mission needs, typically 10–12 sailors and embarked personnel from units like Coast Guard detachments or United States Marine Corps small teams. Propulsion comprised dual diesel engines driving waterjets for speeds exceeding 35 knots and 12–15 knot cruise endurance for transit ranges supporting U.S. Fifth Fleet rhythms. Survivability features reflected naval architecture research from Naval Surface Warfare Center Carderock Division and used aluminum hull construction methods refined by builders such as Lockheed Martin partners.

Armament and sensors

Weapons fit was modular, enabling configurations that supported convoy escort, interdiction, and force protection for amphibious assault ship assets. Typical armament included a remote-operated 25 mm chain gun in a stabilized mount; multiple remote weapon stations for 7.62 mm or 12.7 mm machine guns; and provisions for grenade launchers and crew-served weapons for anti-swarm defense in chokepoints near Bab-el-Mandeb. Sensor suites integrated surface search radar, electro-optical/infrared turrets, and communications gear compatible with Link 16-style networks and Tactical Data Link concepts. Optional mission packages could include unmanned systems control, a small sonar or side-scan capability for mine-hunting collaboration with Explosive Ordnance Disposal (EOD) teams, and over-the-horizon targeting feeds for Tomahawk-style assets.

Operational history

The Mark VI entered operational evaluations supporting United States Central Command and NATO partners, deploying with rotational detachments to Bahrain and Sigonella under task forces conducting maritime security operations. Crews trained with United States Navy SEALs, Marine Expeditionary Units, and Riverine Squadron elements for visit, board, search, and seizure (VBSS) missions. The type participated in multinational exercises such as RIMPAC-adjacent littoral drills and interoperability events with Royal Navy, Royal Australian Navy, and Japan Maritime Self-Defense Force units. Operational feedback emphasized endurance limits during blue-water transits and the utility of modular payloads for missions in the Gulf of Aden and Red Sea.

Variants and upgrades

Planned and implemented upgrades included mission module packages for intelligence, surveillance, and reconnaissance (ISR) roles, improved communications integration for NATO command-and-control interoperability, and enhanced defensive measures influenced by lessons from Operation Enduring Freedom and counter-piracy operations off Somalia. Proposals evaluated hull-hardening, active protection systems, and integration with unmanned surface vessels (USVs) fielded by companies partnering with Naval Sea Systems Command. Industrial upgrades by yards like Austal USA and subcontractors targeted propulsion improvements, corrosion mitigation promoted by Naval Research Laboratory studies, and sensor upgrades driven by requirements from Fleet Forces Command.

Deployment and operators

Operators included United States Navy units assigned to Naval Special Warfare Command, Expeditionary Combat Command, and rotational task groups in U.S. Fifth Fleet areas of responsibility. Embarked detachments sometimes included personnel from the United States Coast Guard Tactical Law Enforcement Teams and Department of Defense interagency partners for maritime security cooperation in hotspots such as the Gulf of Oman and Southeast Asia. International interest led to assessments by partners including United Kingdom Ministry of Defence representatives and observers from Japan Maritime Self-Defense Force and Australian Defence Force during exportability briefings.

Incidents and losses

Operational deployments produced incidents involving mechanical failures, hull damage in heavy seas, and at least one significant mishap during transit that led to damage and subsequent maintenance period overseen by Naval Sea Systems Command and contractor support teams. Crews conducted successful damage-control actions consistent with standards from Surface Warfare Officers School and returned assets to service after repairs at naval shipyards. Investigations into incidents applied lessons from Safety Management System frameworks and influenced later retrofit programs addressing fatigue cracking and mission-system reliability.

Category:Patrol vessels of the United States Navy