South Korea Upgrades 59 F-15K Fighters With EPAWSS for Strike Missions in Defended Airspace.

South Korea will equip its 59 F-15K Slam Eagle fighters with BAE Systems’ AN/ALQ-250 EPAWSS electronic-warfare suite under a Boeing contract announced on July 13, 2026. The upgrade will improve the fleet’s ability to detect, identify, and counter radar-guided threats during air-combat and deep-strike missions.

EPAWSS will be integrated alongside new AESA radars, missile-warning sensors, and mission computers included in a broader modernization package approved by the United States in November 2024. Together, these systems will strengthen the F-15K’s survivability and situational awareness in heavily defended airspace, preserving its value as a long-range strike and deterrence platform.

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South Korea will equip its 59 F-15K Slam Eagle fighters with BAE Systems' AN/ALQ-250 EPAWSS electronic warfare suite, improving radar-threat detection, jamming and survivability during long-range strike missions against defended targets (Picture source: ROK MoD).

EPAWSS replaces three separate F-15 defensive components: the AN/ALR-56C radar-warning receiver, the AN/ALQ-135 internal countermeasures set, and the AN/ALE-45 dispenser. Its digital receivers scan the radio-frequency environment, compare detected emissions with threat data loaded before the mission, estimate emitter location, and present the crew with the identity and status of search, acquisition, and fire-control radars. The system can then apply radio-frequency jamming or command the release of expendables. BAE Systems states that EPAWSS provides all-aspect broadband warning, can process low-probability-of-intercept and frequency-agile signals, and can jam while operating with the APG-82(V)1 radar without mutual interference. It also incorporates an AN/ALE-47 dispenser and provides 50 percent more chaff and flare capacity than the earlier F-15 arrangement. Public information does not disclose frequency coverage, receiver sensitivity, transmitter power, geolocation accuracy, or the specific jamming techniques; those figures are central to combat performance but remain classified.

The operational value comes from shortening and partially automating the defensive sequence. A legacy warning receiver may tell the crew that a radar is present; EPAWSS is intended to distinguish the emitter, determine its bearing and approximate position, assess whether it is searching, tracking, or supporting a missile engagement, and select a response. The accompanying AN/AAR-57 adds a warning against infrared-guided missiles, covering threats that do not require radar illumination. This does not turn the F-15K into a dedicated escort-jamming aircraft, nor does it reduce the fighter’s radar cross-section. It is an internal self-protection system intended to complicate the engagement process long enough for the crew to maneuver, dispense chaff or flares, break radar track, launch a stand-off weapon, or leave the defended area. The APG-82(V)1 and ADCP II are equally important because the radar, electronic-warfare suite, and mission computer must exchange data rapidly if the crew is to act before a surface-to-air missile reaches its terminal phase.

That defensive improvement protects an unusually heavy and varied weapons load. The F-15E-family airframe has a maximum takeoff weight of 81,000 pounds, reaches approximately Mach 2.5, and carries an internal 20 mm M61A1 cannon with 500 rounds; standard air-combat loads include AIM-120 AMRAAM radar-guided missiles and AIM-9 Sidewinders. South Korea also employs the F-15K as a cruise-missile carrier. The AGM-84K SLAM-ER weighs about 675 kilograms, measures 4.4 meters, and has a stated range exceeding 250 kilometers. It uses inertial and GPS guidance, an imaging-infrared terminal seeker, and a two-way data link, allowing attack of fixed land targets or maneuvering ships from outside many point-defense envelopes. The Taurus KEPD 350 is larger: approximately 1,400 kilograms, five meters long, with a range above 500 kilometers and a 480-kilogram two-stage MEPHISTO warhead. Its inertial, terrain-reference, and image-based navigation permits continued flight when GPS is unavailable, while its programmable fuze can initiate the penetrator after counting floors or internal voids in a hardened structure.

EPAWSS changes how those weapons can be employed rather than changing their range or explosive effect. An F-15K carrying Taurus missiles can remain hundreds of kilometers from the target, but it may still encounter long-range surveillance radars, fighter-control radars, or surface-to-air missile coverage while moving to its launch point. SLAM-ER missions can require closer positioning and, when using man-in-the-loop control, continued communications with the missile. Improved threat identification and geolocation allow planners to refine ingress routes, identify radar sectors that should be avoided or suppressed, and decide whether a launch can proceed without exposing the aircraft to an unacceptable engagement probability. This is particularly relevant to the 11th Fighter Wing at Daegu, whose F-15Ks conduct both strike and air-defense training with U.S. forces. The modernization therefore supports a division of labor in which F-35As can be assigned to missions requiring low observability, while F-15Ks provide range, crew capacity, and heavier external weapon loads.

South Korea requires this combination because the principal target set is dispersed, mobile, hardened, and covered by overlapping air defenses. The U.S. Defense Intelligence Agency assessed that North Korea maintains an integrated network protecting Pyongyang, the Demilitarized Zone, both coasts, and strategic infrastructure, using fixed and mobile surface-to-air missiles, antiaircraft artillery, man-portable missiles, camouflage, and underground facilities. The inventory includes SA-2, SA-3, SA-5, and SA-13 systems, while a newer mobile system displayed since 2010 externally resembles the Russian S-300 or Chinese HQ-9. The same assessment described thousands of underground facilities protecting command posts, missile forces, and warfighting stocks. These conditions explain South Korea’s investment in both electronic self-protection and penetrating cruise missiles: EPAWSS addresses the route to the launch area, while Taurus addresses the hardened target after launch.

The limits should remain part of the assessment. U.S. operational testing completed in January 2024 found EPAWSS effective, suitable, and cyber-survivable under the conditions tested, but the Pentagon’s test office stated that performance in a modern combat environment remained uncertain because available ranges could not reproduce the full threat. It also reported inconsistent electronic-attack results between ground and flight events, built-in-test false alarms, and 20 documented deficiencies in the software used to build mission data files. South Korea is therefore buying a tested and fielded system, not a fully characterized solution against every radar it may encounter. Its military value will depend on current threat libraries, Korean access to software updates, realistic joint testing and integration with intelligence, suppression-of-air-defense planning, and weapons employment.

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