Sejong the Great-class destroyers are South Korea's large KDX-III Aegis warships for air defence, strike, and fleet command.
The Sejong the Great class is among the Republic of Korea Navy's most capable surface combatant classes. Built around the Aegis combat system, the ships provide area air defence, anti-submarine warfare, anti-surface capability, and command functions. Their size and missile capacity make them central to Korea's blue-water naval ambitions.
The class combines Aegis sensors, vertical launch cells, naval guns, anti-ship weapons, torpedoes, and helicopters.
A Sejong-class destroyer functions as a powerful air-defence and strike node. The Aegis system lets it track and engage multiple air threats while coordinating with other ships and aircraft. Its large missile load gives the ship flexibility across anti-air, anti-submarine, and land-attack or surface-strike missions depending on loadout.
The class matters because it marks South Korea's transition into top-tier guided-missile destroyer operations.
For HiWars, Sejong the Great-class destroyers are important not just for specifications but for what they signal: Korea can build and operate large, complex, networked warships. That capability supports regional deterrence, alliance operations, and long-range maritime presence.
| Name | Country | Status | Service Year | Description |
|---|---|---|---|---|
ROKS Seoae Ryu Seong-ryong (DDG-993) | 🇰🇷Korea, Republic of | ACTIVE | 2012 – Present | KDX-III Aegis destroyer |
ROKS Yulgok Yi I (DDG-992) | 🇰🇷Korea, Republic of | ACTIVE | 2010 – Present | KDX-III Aegis destroyer |
ROKS Sejong the Great (DDG-991) | 🇰🇷Korea, Republic of | ACTIVE | 2008 – Present | KDX-III Aegis destroyer |
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