U.S. Navy Deploys LCS Mine Warfare System to Secure Strait of Hormuz After Avenger Retirement.

The U.S. Navy has replaced Bahrain-based Avenger-class mine hunters with Independence-class LCS in the Gulf.

Chief of Naval Operations Adm. Daryl Caudle is defending the move as a deliberate shift toward distributed, unmanned mine countermeasures. The Navy retired its last forward-deployed Avenger-class ships in September 2025, transferring the mission to LCS platforms equipped with modular MCM packages, MH-60S helicopters, and unmanned surface systems. The concept keeps sailors outside minefields while extending detection and neutralization reach. Its credibility now depends on performance in the Gulf’s constrained, threat-saturated waters.

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U.S. Navy Independence-class littoral combat ships are taking over the mine countermeasures mission in the Middle East, using helicopters, unmanned systems and standoff sensors to help keep strategic waterways such as the Strait of Hormuz open (Picture source: U.S. DoW).

The shift matters because the Navy formally decommissioned its four forward-deployed Avengers in Bahrain in September 2025 after decades of service in U.S. 5th Fleet. Those ships were purpose-built mine hunters with fiberglass-sheathed wooden hulls, deliberately engineered for low magnetic signature and close-in work against moored and bottom mines. Their retirement transferred the regional mission to Independence-variant LCSs, which are designed to keep the manned ship outside the mine danger area while unmanned and airborne systems do the dangerous work forward.

That is the core technical difference between the two U.S. mine warfare ship types now in service. The Avenger class is a classic hunt-and-kill platform: 224 feet long, about 1,312 tons, slow, specialized, and optimized to operate close to the threat with sonar, video systems, cable cutters, conventional sweep gear, and remotely controlled mine neutralization devices. The Independence-class LCS is something else entirely: a 419-foot trimaran capable of more than 40 knots, with a 104-foot beam, large mission bay, reconfigurable payload space, and aviation capacity for up to two H-60 helicopters. In mine warfare, it behaves less like a minesweeper and more like a mothership for distributed sensors and robotic systems.

The LCS mine warfare value sits inside the mission package. The package is built to detect, localize, classify, sweep, and neutralize surface, near-surface, in-volume, moored, bottom, and even some buried mine threats while the ship remains outside the minefield. Its MCM unmanned surface vehicle tows the AN/AQS-20 minehunting sonar for remote minehunting. The MH-60S Seahawk carries the AN/AES-1 Airborne Laser Mine Detection System to spot near-surface moored mines and the AN/ASQ-235 Airborne Mine Neutralization System to prosecute them. The same unmanned surface craft also supports the Unmanned Influence Sweep System, which reproduces magnetic and acoustic signatures to trigger influence mines. In concept, this is a layered, standoff kill chain rather than a single-ship sweep drill.

Caudle’s CSIS remarks are important because they clarified the Navy’s actual view of this force. He acknowledged that purpose-built ships are still the best answer for dedicated mine warfare, praised the Avenger class for serving well, and admitted the irony that demand for mine clearance rose just as the Bahrain-based ships had been retired. But he also argued that when the full MCM package is embarked on an LCS, it is an effective capability, especially when reinforced by remaining airborne mine countermeasures capacity, expeditionary MCM teams, and allied and partner contributions. That is a more nuanced position than a simple “LCS replaced Avenger” narrative.

Caudle stressed that mine search and destruction is slow, deliberate work and that none of these options performs well in a non-permissive environment. That warning goes to the heart of mine warfare in the Gulf. A mine countermeasures force is vulnerable by design because it must move methodically, focus on the water column and seabed, and often operate under aviation, drone, missile, and small-boat threat. In other words, mine clearance is not just a technical task. It is a combined-arms problem requiring local sea control, air and missile defense, intelligence support, and often coalition escort if the clearing force is to survive long enough to open a lane.

That makes the Middle East one of the few places where U.S. mine warfare remains strategically decisive. The Strait of Hormuz and nearby approaches compress naval and commercial traffic into confined waters ideally suited for mining, harassment, and coercive signaling. The Energy Information Administration assessed that in 2024 and the first quarter of 2025, flows through Hormuz accounted for more than one-quarter of global seaborne oil trade, about one-fifth of global oil and petroleum product consumption, and around one-fifth of global LNG trade. A relatively small number of naval mines, even if not massed, can therefore impose outsized military and economic effects by slowing convoy movement, raising insurance costs, diverting escorts, and threatening tanker traffic.

This is why the United States still needs layered mine warfare capacity, not a single-platform answer. The ship-based force now consists of Independence-class LCSs with the MCM package and the remaining Avenger-class ships still based in Japan, but that inventory is only part of the operational picture. Heavy-lift airborne MCM capability, expeditionary explosive ordnance disposal teams, unmanned underwater and surface systems, and allied mine warfare units all remain essential. The Middle East does not reward elegant procurement theories; it rewards redundancy, endurance, and the ability to clear a route under pressure. The Navy’s transition to standoff, unmanned mine warfare is strategically logical, but the Gulf is proving that the concept will only be credible when it demonstrates reliability, availability, and survivability under real operational strain.