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Naval Warfare

JS Atago (DDG-177)

Guided-Missile Destroyer Warship [ 2007 ]

JS Atago leads its class of two guided missile destroyer warships and provides a critical defensive component for the nation of Japan.

Authored By: Staff Writer | Last Edited: 03/25/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

Japan owns one of the top defense budgets in the world and, due to the importance of its geographic location concerning trade and the rise in tensions with its regional neighbors, is forced to field an advanced naval fleet. The Atago-class guided missile destroyers were taken into service in the 2000s and currently (2016) number two warships - JS Atago (DDG-177) as the lead and JS Ashigara (DDG-178) as her sister. The class succeeded the still-capable Kongo-class (four ships) and were built from 2004 to 2008. JS Atago was completed by Mitsubishi Heavy Industries (MHI) and maintains an active presence in the Japan Maritime Self-Defense Force (JMSDF) inventory.

Compared to the Kongo-class they followed, the Atago-class destroyers improved helicopter functions by adding an onboard hangar and were given additional decks at the bridge superstructure (raising the bridge some). The turreted deck gun was also addressed through better engagement range and inherent firepower.

The American influence in Japanese warships is apparent - indeed the JS Atago takes on a similar form and function to the United States Navy's Arleigh Burke-class of guided missile destroyers. The Atago is also outfitted with the American-made "AEGIS" weapon system offering strong anti-missile capabilities through sophisticated scanning, tracking and engagement of incoming airborne threats. Its helicopter component is also the Sikorsky SH-60K navy helicopter, manufactured locally by Mitsubishi, and the propulsion scheme is a license-produced General Electric system.

As built, Atago displaces 7,700 tons under standard loads and over 10,000 tons under full loads. She showcases an overall length of 541.3 feet, a beam of 68.10 feet and a draught of 20.3 feet. Power is from 4 x Ishikawajima Harima (General Electric) LM2500-30 gas turbines developing 100,000 horsepower to 2 x shafts allowing for speeds to reach 30 knots in ideal conditions. Her crew complement numbers 300 and a full service deck and hangar facility aids in the launching and retrieval of maritime helicopters. The helicopter is further equipped to deal with ship and submarine threats and serve in the Search and Rescue (SAR) role when needed - all the while provided valuable over-the-horizon reconnaissance.

Onboard systems include the AN/SPY-1D(V) Passive Electronically-Scanned Array (PESA) radar, the OPS-28E surface search radar, AN-SQS-53C sonar, three AN/SPG-62 Fire Control Systems (FCSs), AN/SQQ-89 ASW unit, and the Mk 46 Optronic director. Electronic Warfare (EW) is through the NOLQ0-2 system and four Mk 36 SRBOC countermeasures kits are carried.

Armament is led by a 64-cell bank of Mk 41 Vertical Launch Systems (VLSs) along the forecastle and a 32-cell bank near the stern. These support the SM-2MR Surface-to-Air Missile (SAM), the SM-3 Anti-Ballistic Missile (ABM) and the RUM-139 ASROC (Anti-Submarine ROCket) system. 2 x Type 90 quad launchers are seated at midships for SSM-1B Anti-Ship Missiles (ASMs). 2 x Type 68 triple torpedo tubes (Mk 46 or Type 73 torpedoes) are carried for anti-submarine work. More conventional armament is had in the single 5" Mk 45 Mod 4 turreted deck gun over the bow and 2 x 20mm Phalanx Close-in Weapon Systems (CIWSs) - one identified ahead of the bridge superstructure and the other near the aft superstructure for good all-round protection at short-range.

Her profile silhouette is consistent with ships of this class and type - the bridge superstructure is found just aft of the turret, an enclosed pyramidal stealth-minded mast is integrated to this structure, and the smoke funnels are of a low-profile and slab-sided design near midships. The aft superstructure contains a hangar facility and is attached to the stern-based helipad. The bow is sharply-pointed and elevated from the turret to the extreme front end.

Should the situations with North Korea and China escalate, the Atago and her sister will no doubt be called to action in defense of Japanese interests in the region.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.


Operators National flag of modern Japan
National Origin
Commissioned, Active
Project Status
Hull Class
JS Atago (DDG-177); JS Ashigara (DDG-178)

Offshore Bombardment
Offshore bombardment / attack of surface targets / areas primarily through onboard ballistic weaponry.
Offshore strike of surface targets primarily through onboard missile / rocket weaponry.
Maritime Patrol
Active patroling of vital waterways and maritime areas; can also serve as local deterrence against airborne and seaborne threats.
Airspace Denial / Deterrence
Neutralization or deterrence of airborne elements through onboard ballistic of missile weaponry.
Fleet Support
Serving in support (either firepower or material) of the main surface fleet in Blue Water environments.

560.0 feet
(170.69 meters)
69.0 feet
(21.03 meters)
20.2 feet
(6.16 meters)

4 x Ishikawajima Harima (General Electric) LM2500-30 gas turbines developing 100,000 horsepower to 2 x shafts.
30.0 knots
(34.5 mph)
Surface Speed
4,501 nm
(5,180 miles | 8,336 km)
1 knot = 1.15 mph; 1 nm = 1.15 mile; 1 nm = 1.85 km

1 x 5" Mk 45 Mod 4 deck gun.
1 x 64-cell Vertical Launch System (VLS) at bow (support for SM-2MR, SM-3 and RUM-139 ASROC missiles).
1 x 32-cell VLS at stern (support for SM-2MR, SM-3 and RUM-139 ASROC missiles).
2 x Type 90 quadruple missile launchers.
2 x Type 68 triple-torpedo tubes.
2 x 20mm Phalanx Close-In Weapon Systems (CIWSs).

1 x Mitsubishi SH-60K ASW/SAR navy helicopter.

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Image of the JS Atago (DDG-177)
Image from the United States Department of Defense DVIDS image network.
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Image of the JS Atago (DDG-177)
Image from the United States Department of Defense DVIDS image network.

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