MSI Defense Integrates LIONFISH System on Patrol Vessel
The weapon system upgrade enhances the capability of a former U.S. Coast Guard cutter transferred to Greece.
Updated on Oct. 22, 2026 in Military
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In October 2026, MSI Defense completed the integration of a Leonardo LIONFISH 20 weapon system onto a former U.S. Coast Guard cutter. The vessel is slated for service with the Hellenic Navy as part of a Foreign Military Sales program.
Why it matters
This integration provides modernized defensive capabilities for an allied naval partner using surplus equipment. It reflects the ongoing efforts to bolster regional maritime security through international hardware transfers.
The LIONFISH 20 weapon system features a 20mm machine gun supported by a coaxial sensor suite, including daylight cameras, infrared sensors, and a laser range finder. The project marks another milestone for MSI Defense, which has specialized in maritime weapon integrations since 2021.
The players
MSI Defense
This company specializes in engineering and maritime weapon integration services for defense clients.
Hellenic Navy
This is the naval force of Greece that maintains maritime sovereignty and territorial security.
The details
The integration process involved structural reinforcements, turret mounting modifications, and command station enhancements. Engineers conducted load analysis, recoil assessments, and sea state modeling to ensure the vessel remains stable and operationally ready.
Timeline
MSI Defense has performed maritime weapon integrations since 2021.
Four Island-class coastal patrol vessels were inducted into the Hellenic Navy in January 2025.
The LIONFISH system integration was announced as completed in October 2026.
Political Context
Opponents of increased military hardware transfers often argue that such sales can escalate regional tensions or lead to mission creep in foreign theaters. Dissenting voices typically call for greater oversight to ensure that transferred surplus assets do not compromise regional power balances.
This upgrade ensures the vessel meets the modern operational requirements of the Hellenic Navy. It impacts regional maritime security by extending the service life of retired U.S. equipment through contemporary defense technologies.
The takeaway
Modernizing legacy naval vessels through modular weapons systems offers a cost-effective way to maintain operational relevance. Such upgrades provide a blueprint for how military surplus can be repurposed to support the needs of allied nations.
Further reading
For broader context on international equipment transfers, visit the Military section.
Source note: This article includes information reported by Naval News.
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