South Korea Upgrades AH-64E Apache Fleet With Longbow Radar and Drone Teaming in $1.2B Deal.

South Korea is set to strengthen the combat effectiveness of its AH-64E Apache fleet after the U.S. Department of State approved a possible $1.2 billion upgrade package focused on sensors, survivability, secure networking, and manned-unmanned teaming, with Boeing named as the principal contractor in the May 18 notification. The modernization will improve the Republic of Korea Army’s ability to detect, track, and engage targets in contested environments while expanding coordination with drones and allied forces during high-intensity operations on the Korean Peninsula.

The package includes AN/APG-78 Longbow radars, Link 16 terminals, advanced missile warning systems, upgraded radios, and MUM-TX capabilities that allow Apaches to share battlefield data and operate more effectively with unmanned systems. The limited number of Longbow radar sets suggests South Korea is building a networked hunter-killer structure in which radar-equipped aircraft provide targeting data for other helicopters and ground forces, reflecting the growing emphasis on distributed battlefield awareness and cooperative strike operations.

Related topic: U.S. Army Soldiers in South Korea Turn Small Drones into Frontline Strike Weapons.

South Korea's AH-64E Apache helicopters are set for a $1,2 billion U.S.-approved upgrade adding Longbow radar, Link 16, and missile warning systems, night-vision sensors, and manned-unmanned teaming for improved detection, survivability, and anti-armor operations near the DMZ (Picture source: South Korea MoD).

South Korea’s Apache requirement should be read against the age and structure of its existing force. Seoul selected 36 AH-64E helicopters through Foreign Military Sales in 2013 under a program valued at about $1.6 billion, and that fleet is now old enough for communications, mission computer, sensor, and survivability updates to matter operationally. A separate 2024 U.S. approval covered up to 36 additional AH-64E attack helicopters, 76 T700-GE-701D engines, 14 AN/APG-78 radars, 456 AGM-114R2 Hellfire missiles, 152 AGM-179A Joint Air-to-Ground Missiles, M230E1 30 mm guns, M261 rocket launchers, M299 missile launchers, 2.75-inch rockets, 30 mm ammunition, and countermeasure expendables. The new upgrade package, therefore, appears aimed at keeping the existing force tactically relevant, whether or not South Korea expands Apache numbers at the originally envisaged scale.

The armament matters because the AH-64E is a close-combat attack helicopter built around a balanced weapons set, not a single missile. Published technical data gives the aircraft a maximum level speed above 150 knots, a service ceiling of 20,000 feet, and an ordnance fit of up to 16 Hellfire missiles, 76 2.75-inch rockets, and 1,200 rounds for the 30 mm chain gun, with the gun firing at 600 to 650 rounds per minute. In Korean terrain, the M230E1 provides immediate fire against infantry, light vehicles, exposed anti-tank teams, and firing positions; Hellfire and JAGM provide precision effects against tanks, command vehicles, self-propelled artillery, air defense vehicles, and hardened point targets; and 2.75-inch rockets provide volume fire against dispersed troops or soft-skinned vehicles during movement-to-contact, route security, and counter-infiltration missions.

The AN/APG-78 Longbow Fire Control Radar is the most significant sensor in the package. Mounted above the rotor, it allows an AH-64E to search for and classify targets while using ridgelines, tree lines, buildings, or reverse slopes to reduce exposure. That has a specific application on the Korean Peninsula: attack helicopters may need to operate in narrow valleys, along river crossings, near urban belts north of Seoul, or behind forward defensive lines where North Korean armor, artillery vehicles, and mobile air defenses can move under short warning times. A radar-equipped Apache can detect and prioritize targets, pass tracks to other aircraft that may not carry the radar, and support missile engagements without every helicopter having to expose itself for visual identification.

The communications upgrades change the aircraft’s role in the kill chain. The KOR-24A Small Tactical Terminal is a two-channel radio designed to bring Link 16 data exchange and secure voice to aircraft with limited size, weight, and power margins, while the AH-64E V6 configuration uses Link 16 to support joint data exchange, text messaging, imagery transfer, and a more current cockpit view of friendly and enemy activity. In practical terms, this allows a South Korean Apache crew to receive target data from a ground command post, a U.S. aircraft, another Apache, or a drone; update friendly-force awareness; and pass a target location to artillery, combat aircraft, or ground maneuver elements. This is less about adding another radio than about reducing the time between detection, decision, and engagement.

MUM-TX is the other major operational change. The AH-64E’s manned-unmanned teaming capability allows aircrews to use off-board sensors, receive unmanned aircraft video, and in advanced configurations, control unmanned aircraft sensors and flight paths. For South Korea, this is relevant because drones can move ahead of the helicopter force, identify artillery positions or armor columns, and reduce the need for crews to fly into short-range air defense envelopes. The AAR-57 Common Missile Warning System and Enhanced Image Intensifier cameras support the same operational logic: the helicopter must detect threats earlier, operate at night and in degraded visibility, and exit the engagement before North Korean air defense teams, mobile guns, or shoulder-fired missile operators can react.

The strategic case is concrete: North Korea fields one of the world’s largest militaries, with commonly cited estimates of about 1.3 million active personnel, hundreds of thousands of reservists, several million paramilitary reservists, and more than 6,900 tanks and armored vehicles. Most of its ground forces are positioned close to the 248-kilometer Demilitarized Zone, while Seoul lies roughly 40 to 50 kilometers from the border. North Korea also maintains large numbers of tube artillery, multiple rocket launchers, short-range ballistic missiles, and special operations forces designed to create early pressure on command nodes, air bases, bridges, logistics routes, and civilian areas in the opening phase of a crisis.

The upgrade also reflects a changing regional military environment. North Korea’s emphasis on frontline fortifications, drone use, precision fires, electronic warfare, and tactical missiles follows its observation of recent conflicts and its growing military relationship with Russia. For Seoul and Washington, an upgraded AH-64E force improves interoperability, gives South Korea a faster anti-armor and reconnaissance-strike option below the threshold of strategic fires, and complicates North Korean planning by linking helicopter crews, drones, artillery, and command networks into a shorter targeting cycle. The $1.2 billion package is therefore not simply an Apache sustainment measure. It is a network, sensor, and survivability upgrade intended to keep South Korea’s attack helicopter force usable in a denser, faster, and more electronically contested battlefield.

Written by Evan Lerouvillois, Defense Analyst.

Evan studied International Relations, and quickly specialized in defense and security. He is particularly interested in the influence of the defense sector on global geopolitics, and analyzes how technological innovations in defense, arms export contracts, and military strategies influence the international geopolitical scene.