Naval Group launches second French FDI frigate Amiral Louzeau while securing major Swedish frigate deal.

Naval Group launched the French Navy’s second FDI frigate, Amiral Louzeau, on May 19, 2026, while Sweden simultaneously selected the same design for its future Luleå-class fleet, confirming the FDI’s emergence as a NATO-focused combat platform rather than a purely national frigate program. The parallel expansion of French, Greek, and Swedish orders strengthens Europe’s high-end naval air defense capacity and secures long-term serial warship production at Lorient as Western navies accelerate rearmament against missile saturation and submarine threats.

The 4,500-ton FDI combines Sea Fire AESA radar, integrated digital combat management, and advanced anti-submarine warfare systems within a compact hull optimized for high-intensity operations and sustained NATO deployments. France’s decision to retrofit all five ships with 32 vertical launch cells reflects a broader shift toward preparing for large-scale drone and cruise missile attacks, while Swedish adoption expands the operational footprint of Aster missile defense and French naval combat systems across the Baltic and North Atlantic theaters.

Related topic: Sweden confirms French FDI frigate selection for $5 billion Lulea-class program to counter Russia

Naval Group launched the second French Navy FDI frigate Amiral Louzeau on May 19, 2026, concurrently with the Swedish government announcement selecting the FDI design for its four-ship Lulea-class frigate program. (Picture source: Naval Group)

On May 19, 2026, Naval Group launched the French Navy’s second FDI frigate, Amiral Louzeau (D661), at Lorient, confirming the transition of the FDI program toward stabilized serial production while Sweden simultaneously selected the FDI design for its four-ship Luleå-class program. The launch occurred 19 months after the first ship, Amiral Ronarc’h, entered the water and seven months after the lead ship joined the French Navy in October 2025. France plans to field five FDIs between 2025 and 2032 to preserve a force of 15 first-rank surface combatants after the FREMM fleet reduction from 17 to eight ships.

Combined French, Greek, and Swedish orders now total 13 hulls, while Lorient sustains parallel domestic and export construction at a projected rate approaching two frigates annually through modular assembly and parallel integration. The FDI frigate consequently evolved from a national La Fayette-class replacement effort into a multinational NATO-oriented frigate architecture combining fleet recapitalization, export competition, and sovereign naval industrial continuity. The frigate is named after Admiral Bernard Louzeau, Chief of Staff of the French Navy from 1987 to 1990 and one of the officers associated with the operational consolidation of France’s sea-based nuclear deterrent.

After joining the submarine force in 1952, Louzeau later supervised the construction of Le Redoutable, France’s first nuclear-powered ballistic missile submarine (SSBN), and became its first commanding officer in 1968. He directed sea trials and commanded the submarine’s first operational deterrent patrol beginning on January 28, 1972, during which Le Redoutable reportedly maneuvered near Soviet search operations linked to the K-19 fire incident while avoiding Soviet and U.S. detection. Louzeau later commanded the Strategic Oceanic Force in 1984 before becoming Major General of the Armed Forces in 1985 and Chief of Staff of the French Navy under President François Mitterrand in 1987.

His career corresponded to the restructuring of the French Navy around continuous SSBN patrol permanence, blue-water anti-submarine warfare, and strategic deterrence operations. The FDI (Frégate de Défense et d’Intervention) development, for its part, began in 2015 under the designation Frégate de Taille Intermédiaire (FTI) before being redesignated Frégate de Défense et d’Intervention in 2019 as operational requirements expanded toward high-intensity combat and integrated air defense. France’s procurement includes Amiral Ronarc’h, Amiral Louzeau, Amiral Castex, Amiral Nomy, and Amiral Cabanier.

The first three ships were ordered in March 2021, while the fourth and fifth followed in December 2025 and March 2026. Industrial sequencing changed after Naval Group reassigned a French production slot to the Hellenic Navy’s fourth frigate, HS Formion, delaying Amiral Louzeau by one year and making it the fifth hull assembled within the multinational production flow despite remaining France’s second ship. Steel cutting associated with the revised sequence dates to July 12, 2023, while launch occurred on May 19, 2026, after roughly 20 months of assembly, compared with nearly 30 months for Amiral Ronarc’h.

French planning foresees deliveries in 2027, 2028, 2031, and 2032 for the remaining ships. The FDI displaces 4,460 tons at full load, measures 121.6 to 122 meters in length with a beam between 17.7 and 18 meters, and uses a CODAD propulsion arrangement with four MTU 16V 8000 M91L diesel engines generating approximately 32 MW combined output. Maximum speed reaches 27 knots, operational range extends to 5,000 nautical miles at 15 knots, and endurance reaches 45 days without replenishment. Crew size ranges between 110 and 125 personnel due to automation of propulsion management, combat system administration, and navigation processing.

Electrical generation relies on six Scania generators, while the hull incorporates reserved positions for future launch modules, electronic systems, and close-range defensive equipment. Aviation facilities support NH90 NFH or H160M helicopters together with rotary-wing drones such as the VSR700, while side deployment positions support ECUME NG or EDO NG commando boats and future unmanned surface systems. The FDI’s key technical feature is the PSIM integrated mast, a 42-meter structure weighing roughly 150 tons that centralizes radar arrays, communications equipment, electronic warfare systems, the combat operations center, and one of the ship’s two onboard data centers.

The Sea Fire radar uses four fixed S-band AESA panels providing uninterrupted 360-degree coverage without rotating antennas and reportedly detects air targets beyond 300 km while tracking surface contacts at roughly 80 km. Anti-submarine warfare capability relies on the Thales KingKlip Mk2 hull sonar and the CAPTAS-4 Compact variable-depth towed sonar optimized for long-range submarine tracking. Combat management is handled by Naval Group’s SETIS 3.0 architecture connected to two physically separated data centers responsible for radar processing, combat system computation, sensor fusion, navigation distribution, and cyber monitoring.

This concept replaces earlier federated subsystem architecture with a new centralized, software-defined combat management intended to support future upgrades through software integration rather than extensive hardware replacement. The original French FDI configuration incorporated only 16 Sylver A50 vertical launch cells carrying Aster 15 or Aster 30 interceptors, creating a mismatch between radar tracking capacity and available missile inventory. Under standard French doctrine requiring two interceptors per target, the baseline configuration permitted engagement of only eight simultaneous threats before depletion despite the radar’s ability to track several hundred contacts.

Following a reassessment of saturation threats observed in Ukraine and the Red Sea, Admiral Nicolas Vaujour confirmed on April 9, 2026, that all five French FDIs would transition toward 32-cell configurations. Amiral Nomy and Amiral Cabanier will enter service directly with 32 cells, while Amiral Castex will receive additional launchers shortly after commissioning, and Amiral Ronarc’h, together with Amiral Louzeau, will undergo retrofits during their first major maintenance cycles. The modification doubles theoretical simultaneous engagement capacity from eight to 16 intercepts without changes to radar or combat management architecture because the hull already incorporates reserved launcher positions.

The industrial dimension of the FDI program expanded significantly after Sweden formally selected the design on May 19, 2026, for the future Luleå-class requirement following evaluations against Saab/Babcock’s Arrowhead 120 derivative and Navantia’s Alfa 4000. Stockholm identified delivery speed, operational maturity, and integrated long-range air defense capability as the decisive criteria following Russia’s invasion of Ukraine and Sweden’s NATO accession on March 7, 2024. Swedish planning, therefore, shifted away from stealth-focused littoral operations centered on Visby-class corvettes toward larger escorts capable of convoy protection, ballistic missile defense, reinforcement corridor security, and sustained North Atlantic deployments.

Swedish planning currently points toward ships equipped with 32-cell launch systems, Aster 30 interceptors, CAMM-ER missiles, Saab combat management components, and RBS-15 anti-ship missiles. Lorient is now responsible for five French ships, four Greek frigates, and four Swedish vessels, creating a confirmed production run of 13 hulls extending into the 2030s. The FDI frigate also reflects a broader restructuring of French naval planning, away from post-Cold War expeditionary assumptions and toward sustained high-intensity maritime warfare involving missile saturation attacks, distributed operations, integrated NATO air defense, and long-duration deployments.

Compared with larger U.S. or British destroyer and frigate designs, the FDI prioritizes sensor density, digital combat management, and automation within a constrained 4,500-ton hull to preserve fleet mass and maintain export affordability. The decision to retrofit all French ships with 32 vertical launch cells demonstrated that French naval leadership concluded the original missile inventory was insufficient against contemporary strike environments characterized by large drone and cruise missile salvos. Parallel French Navy discussions regarding a possible increase from 15 to 18 first-rank escorts further indicate concerns regarding deployment sustainability and force availability during simultaneous crises.

Written by Jérôme Brahy

Jérôme Brahy is a defense analyst and documentalist at Army Recognition. He specializes in naval modernization, aviation, drones, armored vehicles, and artillery, with a focus on strategic developments in the United States, China, Ukraine, Russia, Türkiye, and Belgium. His analyses go beyond the facts, providing context, identifying key actors, and explaining why defense news matters on a global scale.