South Korea Deploys First MH-60R Seahawk Helicopters to Hunt North Korean Submarines.

South Korea has deployed its first MH-60R Seahawk helicopters at Jinhae, activating a new anti-submarine warfare capability.

The Republic of Korea Navy placed two U.S.-built Seahawks into operational service on April 1, 2026, marking the transition from procurement to frontline capability. Additional aircraft will follow in phases under a 12-helicopter program, giving Seoul a networked airborne platform designed to extend fleet detection range, compress response timelines, and integrate with U.S. naval systems in high-threat maritime environments.

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South Korea has begun operational deployment of its first MH-60R Seahawk helicopters, giving the ROK Navy a major boost in anti-submarine and anti-surface warfare capability as it strengthens maritime deterrence against North Korean threats (Picture source: South Korean Navy).

The initial operational deployment is limited to two aircraft, with the remaining helicopters to enter service in phases, but even this first step matters because it begins converting a procurement program into usable combat power. South Korean naval leadership has framed the Romeo as a platform that will improve detection, tracking and attack performance against hostile vessels and submarines, not simply add another helicopter type to the inventory.

The MH-60R is the U.S. Navy’s primary anti-submarine and surface-warfare helicopter, optimized for operations from aviation ships and other air-capable combatants. It is powered by two GE T700-GE-401C or -401D engines, carries a crew of three, measures 64 ft 10 in in length, stands 17 ft high, and has a maximum gross weight of 23,500 lb. South Korean reporting says it can reach 333 km/h and remain airborne for up to four hours with an auxiliary fuel tank, a combination that gives the ROK Navy much better time on station than lighter shipborne helicopters.

The real value of the helicopter, however, is its mission system. The original U.S. Foreign Military Sales approval for South Korea covered 12 APS-153(V) multi-mode radars, 12 Airborne Low Frequency Sonar systems, 12 AN/AAS-44C(V) multispectral targeting systems, Link 16 terminals, embedded GPS/inertial navigation systems with anti-spoofing protection, secure radios, IFF transponders and 1,000 sonobuoys. In operational terms, that package creates an airborne sensor node able to search above and below the surface, classify contacts, maintain tracks and share targeting-quality data with ships and allied networks.

That is why the MH-60R is tactically important. A surface combatant’s hull sonar is constrained by geography, sea state, ship position and reaction time, while a Romeo can rapidly dash to a datum, deploy sonobuoys, hover and dip sonar, and then relay the track back through secure networks. In U.S. Navy service, the aircraft is built around anti-submarine warfare, surface warfare, electromagnetic warfare and command-and-control missions, and it routinely operates with sonobuoys, lightweight torpedoes and Hellfire-class anti-surface weapons. For South Korea, even before discussing specific national weapon fits, the platform’s core advantage is that it compresses the detect-to-engage cycle against submarines and fast surface contacts.

Seoul is deploying the type because it needs an aviation asset that can push the anti-submarine screen farther from the fleet and prosecute contacts faster than legacy arrangements allow. The 2019 U.S. policy justification for the sale explicitly stated that the helicopters would improve South Korea’s anti-surface and anti-submarine warfare capability and strengthen homeland defense and deterrence, while the April 1 deployment was tied directly to better detection and attack capability against North Korean vessels and submarines. A navy expanding blue-water task-group operations needs an embarked helicopter that extends the ship’s sensor and weapon reach, not one that merely supports utility missions.

The acquisition path shows how long Seoul has been working toward this outcome. Washington approved a possible sale of 12 MH-60Rs in August 2019 for an estimated $800 million. South Korea’s Defense Acquisition Program Administration then selected the MH-60R in December 2020 for the Maritime Operation Helicopter Batch II requirement, approving a 960 billion won program for 12 aircraft. On April 12, 2021, the U.S. Navy awarded Lockheed Martin a $447.23 million production order for the 12 helicopters, with completion planned for December 2024. Taken together, those figures indicate a standard FMS structure in which the Korean program budget covered more than just the airframes, including support, integration, training and associated government-managed costs.

Delivery then moved from paper to metal. The first MH-60R was delivered to the South Korean Navy in September 2024, underscoring both improved anti-submarine and anti-surface warfare capability and greater interoperability with U.S. forces. Seoul has since continued building out the fleet and support structure; in a separate notification, the U.S. government also cleared a possible $350 million package for six additional T700 engines and sustainment items for the MH-60R force. That matters because maritime helicopters only deliver combat value when the spare-engine, maintenance and training pipeline is funded early, not after readiness begins to slip.

For the ROK Navy, the Seahawk does not enter an empty force structure. South Korea already fields eight AW159 Wildcats, but the Romeo adds a heavier and more networked ASW/ASuW capability that is better matched to larger surface combatants and long-duration prosecution missions. The new KDX-III Batch 2 destroyer Jeongjo can embark an MH-60R, giving Seoul a more layered naval aviation mix and a clearer path to integrating airborne ASW into high-end escort operations. In practical terms, this expands the navy’s ability to build a multi-layered maritime screen in which surface combatants, onboard helicopters and networked sensors work together rather than as separate assets.

From an operational standpoint, the Romeo is especially relevant on the Korean Peninsula because it strengthens response options in a maritime environment where warning times can be short and contact management is difficult. North Korea’s submarine force may not match major naval powers in sophistication, but it remains a persistent challenge because even a limited undersea threat can force a defender to allocate disproportionate resources to surveillance, convoy protection and fleet defense. A helicopter that can rapidly investigate contacts, localize submarines, and support weapon employment extends the fleet commander’s reach well beyond the ship’s own sensors.

The strategic meaning of this deployment is therefore larger than two helicopters on one air station ramp. South Korea is investing in a maritime kill chain that is faster, deeper and more interoperable with U.S. naval practice, while also improving its ability to protect sea lanes, screen major combatants and hold North Korean undersea activity at greater risk. In an era when undersea detection is increasingly central to deterrence in Northeast Asia, the MH-60R gives Seoul something more valuable than a new airframe: it gives the fleet an airborne hunting arm that can find first, track first and, if required, strike first.