Sejong the Great-class destroyer

	ROKS Sejong the Great (DDG-991)
Class overview
Builders	Hyundai Heavy Industries; Daewoo Shipbuilding & Marine Engineering;
Operators	Republic of Korea Navy
Preceded by	Chungmugong Yi Sun-sin class
Succeeded by	KDDX-class destroyer
Cost	$923 million per ship
Planned	6
Building	2
Completed	4
Active	4
General characteristics
Type	Guided-missile destroyer
Displacement	Batch I:; 7,650 tons standard displacement; 10,000 tons full load; Batch II:; 8,200 tons standard displacement; 12,000 tons full load;
Length	Batch I: 166 m (544 ft 7 in); Batch II: 170 m (557 ft 9 in);
Beam	21.4 m (70 ft 3 in)
Draft	6.25 m (20 ft 6 in)
Propulsion	4 × General Electric LM2500 COGAG;; 2 × shafts;; 100,000 shp (75,000 kW) produced power;
Speed	exceeds 30 knots (56 km/h; 35 mph)
Range	5,500 nmi (10,200 km; 6,300 mi)
Endurance	30 days
Complement	300
Sensors &; processing systems	AN/SPY-1D(V) multi-function radar; AN/SPG-62 fire control radar; DSQS-21BZ-M hull-mounted sonar; SQR-220K towed array sonar system; Sagem Infrared Search & Track (IRST) system;
Electronic warfare; & decoys	LIG Nex1 SLQ-200K Sonata electronic warfare suite
Armament	Batch I:; 1 × 5-inch (127 mm)/L62 caliber Mk 45 Mod 4 naval gun; 1 × 30 mm Goalkeeper CIWS; 1 × RAM Block 1 CIWS; 16 × SSM-700K Haeseong anti-ship missile; 2 × triple torpedo tubes for:; K745 Blue Shark torpedo; 1 × 48-cell, 1 × 32-cell (80 cells) Mk 41 VLS for:; SM-2 Block IIIB/IV; 1 × 48-cell K-VLS for:; K-ASROC Red Shark; Hyunmoo III land attack cruise missiles; K-SAAM short range air defence missiles; KM-SAM air defence missiles; Batch II:; 1 × 5-inch (127 mm)/L62 caliber Mk 45 Mod 4; 2 × 20mm Block 1B Phalanx CIWS; 8 × SSM-700K Haeseong anti-ship missile; 2 × triple torpedo tubes for:; K745 Blue Shark torpedo; 1 × 48-cell Mk 41 VLS for:; SM-2 Block IIIB/IV; SM-3 NTW Block IB; SM-6 Block I; 1 × 16-cell K-VLS for:; K-ASROC Red Shark; Hyunmoo III land attack cruise missiles; K-SAAM short range air defence missiles; KM-SAM air defence missiles; 1 × 24-cell K-VLS II for:; L-SAM long range air defence missiles; Hyunmoo IV-2 ballistic missiles;
Aircraft carried	2 × Super Lynx or SH-60 Seahawk
Aviation facilities	Hangar and helipad

The Sejong the Great-class destroyers (Sejongdaewang-Geup Guchukam or Hangul: 세종대왕급 구축함, Hanja: 世宗大王級驅逐艦), also known as KDX-III, are guided-missile destroyers of the Republic of Korea Navy (ROKN).

Class overview
ROKS Sejong the Great (DDG-991)
Builders	Hyundai Heavy Industries Daewoo Shipbuilding & Marine Engineering
Operators	Republic of Korea Navy
Preceded by	Chungmugong Yi Sun-sin class
Succeeded by	KDDX-class destroyer
Cost	$923 million per ship
Planned	6
Building	2
Completed	4
Active	4
General characteristics
Type	Guided-missile destroyer
Displacement	Batch I: 7,650 tons standard displacement 10,000 tons full load Batch II: 8,200 tons standard displacement 12,000 tons full load
Length	Batch I: 166 m (544 ft 7 in) Batch II: 170 m (557 ft 9 in)
Beam	21.4 m (70 ft 3 in)
Draft	6.25 m (20 ft 6 in)
Propulsion	4 × General Electric LM2500 COGAG; 2 × shafts; 100,000 shp (75,000 kW) produced power
Speed	exceeds 30 knots (56 km/h; 35 mph)
Range	5,500 nmi (10,200 km; 6,300 mi)
Endurance	30 days
Complement	300
Sensors & processing systems	AN/SPY-1D(V) multi-function radar AN/SPG-62 fire control radar DSQS-21BZ-M hull-mounted sonar SQR-220K towed array sonar system Sagem Infrared Search & Track (IRST) system
Electronic warfare & decoys	LIG Nex1 SLQ-200K Sonata electronic warfare suite
Armament	Batch I: 1 × 5-inch (127 mm)/L62 caliber Mk 45 Mod 4 naval gun 1 × 30 mm Goalkeeper CIWS 1 × RAM Block 1 CIWS 16 × SSM-700K Haeseong anti-ship missile 2 × triple torpedo tubes for: K745 Blue Shark torpedo 1 × 48-cell, 1 × 32-cell (80 cells) Mk 41 VLS for: SM-2 Block IIIB/IV 1 × 48-cell K-VLS for: K-ASROC Red Shark Hyunmoo III land attack cruise missiles K-SAAM short range air defence missiles KM-SAM air defence missiles Batch II: 1 × 5-inch (127 mm)/L62 caliber Mk 45 Mod 4 2 × 20mm Block 1B Phalanx CIWS 8 × SSM-700K Haeseong anti-ship missile 2 × triple torpedo tubes for: K745 Blue Shark torpedo 1 × 48-cell Mk 41 VLS for: SM-2 Block IIIB/IV SM-3 NTW Block IB SM-6 Block I 1 × 16-cell K-VLS for: K-ASROC Red Shark Hyunmoo III land attack cruise missiles K-SAAM short range air defence missiles KM-SAM air defence missiles 1 × 24-cell K-VLS II for: L-SAM long range air defence missiles Hyunmoo IV-2 ballistic missiles
Aircraft carried	2 × Super Lynx or SH-60 Seahawk
Aviation facilities	Hangar and helipad