NAGASAKI, Japan, June 29, 2026 — The Japan Maritime Self-Defense Force (JMSDF) officially commissioned its 10th Mogami-class frigate, JS Nagara (FFM-10), into active service on Monday during a flag-raising and commissioning ceremony at Mitsubishi Heavy Industries (MHI)'s Nagasaki shipyard.
The vessel was formally accepted into the JMSDF fleet during the ceremony, marking another step in Japan's ongoing effort to modernize its surface fleet. Following its commissioning, JS Nagara will be assigned to the 2nd Patrol Division based at Kure Naval Base in Hiroshima Prefecture.
Modern Frigate with Reduced Crew Requirements
Built by Mitsubishi Heavy Industries at an estimated cost of 52.3 billion yen (approximately $323 million), JS Nagara measures 133 meters in length with a beam of 16.3 meters. The frigate incorporates a stealth-oriented hull design that reduces its radar cross-section while supporting multi-mission naval operations.
The ship is powered by a Combined Diesel and Gas (CODAG) propulsion system consisting of two MAN diesel engines and a Rolls-Royce MT30 gas turbine, enabling speeds of more than 30 knots.
One of the defining features of the Mogami class is its high level of automation. An advanced Ship Handling System integrates navigation, machinery management, and ship control functions into a centralized system, allowing the frigate to operate with a crew of approximately 90 personnel. The automation also supports one-person maneuvering during certain operations, reducing manpower requirements compared with previous JMSDF surface combatants.
Commissioned with Mk.41 Vertical Launching System
Unlike earlier Mogami-class frigates, JS Nagara entered service with a fully installed 16-cell Mk.41 Vertical Launching System (VLS) already integrated during construction.
Earlier ships in the class were commissioned before receiving the launcher, with VLS installations carried out later through retrofit programs. The delays were caused by supply chain disruptions resulting from the COVID-19 pandemic and the global semiconductor shortage, which affected the production schedule of Mk.41 launch systems manufactured under license in Japan by Mitsubishi Heavy Industries.
The Japan Ministry of Defense has since secured contracts for 12 Mk.41 VLS units, which will equip both newly built frigates and earlier vessels that initially entered service without the launcher.
Construction Completed in Approximately Three Years
Construction of JS Nagara progressed from keel laying to commissioning in approximately three years.
The ship's keel was laid at the MHI Nagasaki shipyard on July 6, 2023, before it was launched on December 19, 2024. Following outfitting, sea trials, and final acceptance, the frigate officially entered JMSDF service on June 29, 2026.
Designed for Multi-Mission Operations
The Mogami-class frigates are designed to perform a wide range of missions, including maritime surveillance, anti-submarine warfare, anti-surface warfare, mine countermeasure support, and maritime security operations.
The class has a standard displacement of approximately 3,900 tonnes and a full-load displacement of around 5,500 tonnes. In addition to the Mk.41 VLS, the ships are equipped with a 127 mm Mk.45 Mod 4 naval gun, Type 17 anti-ship missiles, a SeaRAM close-in weapon system, lightweight torpedoes, and facilities to operate one helicopter.
Part of Japan's Largest Post-War Frigate Program
The Mogami-class program was launched in 2019 to replace the aging Hayabusa-class missile boats and Abukuma-class escort destroyers. It represents Japan's largest naval shipbuilding program since the end of the Second World War.
To accelerate production, Mitsubishi Heavy Industries adopted a construction strategy that allowed two hulls to be built simultaneously.
The first two ships, JS Mogami and JS Kumano, had their keels laid on October 29 and October 30, 2019, respectively. Although JS Kumano was launched on November 19, 2020, the lead ship JS Mogami was launched later on March 3, 2021, after technical damage occurred to its Rolls-Royce MT30 gas turbine during bench testing because of a faulty test-rig component.
Following the resolution of that issue, construction of the subsequent ten frigates proceeded without major interruption.
The current procurement phase of 12 Mogami-class frigates is now nearing completion. On December 22, 2025, Mitsubishi Heavy Industries held the naming and launching ceremony for JS Yoshii, the 12th and final ship of the class.
With the commissioning of JS Nagara, the JMSDF continues to strengthen its fleet with modern, highly automated multi-mission frigates as Japan advances its long-term naval modernization program.
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