Sejong the Great

The Sejong the Great class was developed as the third phase of South Korea's Korean Destroyer eXperimental program. It marked a major step from coastal defence toward blue-water naval capability, pairing domestic shipbuilding with the U.S. Aegis combat system. The class reflects South Korea's need to defend sea lanes, counter missiles, and operate with allied naval forces.

Technically, Sejong the Great-class destroyers are among the largest and most heavily armed Aegis destroyers. They carry a large vertical launch system capacity for air defence, anti-submarine, land-attack, and other guided weapons depending on loadout. Their sensors and combat system make them high-value command and air-defence ships rather than simple surface escorts.

Operationally, the class supports fleet air defence, missile surveillance, task group command, anti-submarine operations, and allied exercises. Its size and combat-system sophistication make it central to South Korea's maritime deterrence posture. The ships are also important symbols of the ROKN's transition into a more capable regional navy.