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
Planned	6
Building	2
Completed	4
Active	3
General characteristics
Type	Guided-missile destroyer
Displacement	7,650 tons standard displacement; 10,600 tons full load;
Length	Batch 1 166 m (544 ft 7 in), Batch 2 170 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 and ; 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	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;
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 three guided-missile destroyers of the Republic of Korea Navy (ROKN).

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