{
  "id": "sejong-the-great",
  "name": "Sejong the Great Class (KDX-III Class)",
  "aliases": [],
  "domain": "naval",
  "country": "KOR",
  "category": "Destroyer",
  "status": null,
  "fielded": 2008,
  "operators": [
    "KOR"
  ],
  "prolif_count": 1,
  "summary": "The Sejong the Great-class, also known as KDX-III, are three guided missile destroyers of the Republic of Korea Navy (ROKN). The ROKN has deployed three ships with an option for three more which was taken up in December 2013.",
  "specs": [
    {
      "k": "crew",
      "v": 350,
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "length_m",
      "v": 135.9,
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "beam_m",
      "v": 21,
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Draft",
      "section": "dims",
      "v": "10.5 m",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Displacement (standard)",
      "section": "dims",
      "v": "7,773 tons",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "displacement_t",
      "v": 10455,
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium",
      "label": "Displacement (full load)"
    },
    {
      "k": "propulsion",
      "v": "4 x General Electric LM-2500",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "speed_kt",
      "v": 30,
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "range_km",
      "v": 9260,
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium",
      "note": "5,000 nm at 14 knots; 4,500 nm at 20 knots"
    },
    {
      "k": "",
      "label": "Gun Fire Control System Name",
      "section": "firecontrol",
      "v": "1 x Mark 160 gun fire control systems",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Missile Fire Control System Name",
      "section": "firecontrol",
      "v": "3 x Raytheon SPG-62 MFCR systems",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Multi-Phased Radar",
      "section": "firecontrol",
      "v": "1 x Lockheed-Martin AN/SPY-1D(V) Aegis multi-phased radar",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Air Search Radar",
      "section": "firecontrol",
      "v": "1 x STX Radar SPS-95K air search; 1 x Northrop Grumman SPW-9B air/surface search; 1 x Thales Nederland MW-08 air/surface search",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Surface Search Radar",
      "section": "firecontrol",
      "v": "1 x DRS SPS-67(V) surface search",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Navigation Radar",
      "section": "firecontrol",
      "v": "1 x Daewoo DTR-92 navigation",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Active and Passive Sonar",
      "section": "firecontrol",
      "v": "1 x Lockheed Martin SQQ-89(V) underwater combat system w/SQS-53C bow-mounted",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Active Protection System",
      "section": "protection",
      "v": "2 x 330-340 round Matra-Defense Dagaie Mark 2 decoy rocket launching system",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Torpedo Decoy",
      "section": "protection",
      "v": "1 x AN/SLQ-25 Nixie torpedo decoy system and 1 x Prairie/Masker noise suppression system",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "EW",
      "section": "protection",
      "v": "1 x SLQ-200(V) SONATA EW system",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "NBC Water Washdown System",
      "section": "protection",
      "v": "Yes",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Chaff/Flares",
      "section": "protection",
      "v": "4 x Mark 36 SRBOC chaff/flare launchers (6-barrel)",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Torpedo System: launcher",
      "section": "armament",
      "v": "2 x triple 324-mm Mk 32 tubes",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Torpedo System: torpedo name",
      "section": "armament",
      "v": "Blue Shark ASW or Mark 46 Mod 5 torpedoes",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Torpedo System: basic load",
      "section": "armament",
      "v": "46",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Aircraft Facilities: aircraft",
      "section": "armament",
      "v": "2 x Super Lynx [carries Sea Skua ASM missiles or U.S. Mark 46, Mod. 5 ASW torpedoes].",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "armament",
      "v": "1 x OTO Melara 127/64; 1 x Goalkeeper CIWS; 2 x Mark 41 VLS (80 Cells); Hyunmoo III",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium"
    },
    {
      "k": "hulls",
      "v": 3,
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium",
      "note": "Hulls listed in the source card"
    }
  ],
  "payloads": [
    {
      "name": "1 x OTO Melara 127/64",
      "role": "Naval Gun",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium",
      "caps": {
        "Type": "Naval Gun",
        "Caliber": "127 mm",
        "Rate of fire": "40 rounds/min"
      },
      "range_km": 100,
      "qty": "1"
    },
    {
      "name": "1 x Goalkeeper CIWS",
      "role": "Close-in-Weapon System (CIWS)",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium",
      "caps": {
        "Type": "Close-in-Weapon System (CIWS)",
        "Caliber": "30 mm",
        "Rate of fire": "70 rounds/second (4,200 rounds/minute)"
      },
      "range_km": 0.4,
      "qty": "1"
    },
    {
      "name": "2 x Mark 41 VLS (80 Cells)",
      "role": "Armament",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium",
      "caps": {}
    },
    {
      "name": "Hyunmoo III",
      "role": "Cruise Missile",
      "src": [
        "weg-sejong-the-great"
      ],
      "conf": "medium",
      "caps": {
        "Type": "Cruise Missile",
        "Length": "6.25 m"
      }
    }
  ],
  "variants": [
    {
      "name": "Sejong the Great",
      "text": "Commissioned: 2008 Status: Active",
      "src": [
        "weg-sejong-the-great"
      ]
    },
    {
      "name": "Yulgok Yi I",
      "text": "Commissioned: 2010 Status: Active",
      "src": [
        "weg-sejong-the-great"
      ]
    },
    {
      "name": "Seoae Ryu Seong-ryong",
      "text": "Commissioned: 2012 Status: Active",
      "src": [
        "weg-sejong-the-great"
      ]
    }
  ],
  "art": "destroyer",
  "image": null,
  "verified": null,
  "changelog": [
    {
      "date": "2026-10-10",
      "change": "Entry created from the Worldwide Equipment Guide (ODIN), bulk import"
    }
  ],
  "url": "https://www.defensepedia.com/systems/sejong-the-great.html",
  "sources": {
    "weg-sejong-the-great": {
      "title": "Sejong the Great Class (KDX-III Class) South Korean Destroyer",
      "publisher": "U.S. Army TRADOC G-2 Worldwide Equipment Guide (ODIN)",
      "url": "https://odin.t2com.army.mil/WEG/Asset/Sejong_the_Great_Class_KDX-III_Class_South_Korean_Destroyer",
      "published": "2026-03-20",
      "tier": 1,
      "checked": "2026-10-10"
    }
  }
}