Internally, the warship has a crew of 300 with 400 possible under war time conditions. An AN/SPY-1D(V) multi-function radar suite drives the primary sensor and processing arrangement. An AN/SPG-62 serves as the fire control radar and a DSQS-21BZ is carried as a hull-mounted sonar. The towed array is an MTeQ unit. The LIG Next1 SLQ-200K "Sonata" functions as the vessel's Electronic Warfare (EW) suite.
In terms of armament, Sejong the Great features an total 80-cell arrangement of Mk 41 Vertical Launch System (VLS) for SM-2 Block IIIB and IV (RIM-66 Standard) medium-range surface-to-air missiles. These are contained in a 48- and 32-cell pairing, one fitted forward and the other aft. Another 48-cell grouping houses 32 x "Hyunmoo III" series cruise missiles for use against land targets and 16 x K-ASROC "Red Shark" anti-submarine missiles to deal with underwater threats. Six K745 LW "Blue Shark" torpedoes are also carried. A turreted 5" Mk 45 Mod 4 naval gun adds a more conventional attack system to the warship and is seated in its traditional place at the forecastle. The 30mm "Goalkeeper" Close-In Weapon System (CIWS) provides the necessary response to short-ranged incoming airborne threats such as cruise missiles, UAVs and aircraft. All told this gives Sejong the Great proper reach against most any naval-going threat to the warship - be they aerial, on the sea or under it in nature.
At the stern position is a full-service helicopter deck with hangar space for two Sikorsky SH-60 (or similar) Seahawk naval helicopters. These systems are kept aboard to increase the eyes and ears of the warship by carrying advanced sonar and radar equipment as well as anti-ship / anti-submarine weaponry. Helicopters also provide greater over-the-horizon vision. The landing pad can seat one additional helicopter beyond the two housed systems allowing the warship to essentially field a total of three rotorcraft under extreme circumstances. The helipad can also accept supply-delivery helicopters and rotary-winged Unmanned Aerial Vehicles (UAVs) as needed.
Sejong the Great remains in active service as of June 2016 and joined by sisters ROKS Yulgok Yi I (commissioned 2010) and Seoae Ryu Seong-ryong (commissioned 2012).
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