New Threat Upgrade

New Threat Upgrade (NTU) was a United States Navy program to improve and modernize the capability of existing cruisers and destroyers equipped with Terrier and Tartar anti-aircraft systems, keeping them in service longer. It was a key component of then-President Ronald Reagan's 600-ship Navy plan.

The Program

USS Mahan (DDG-42) was selected to install and test the Terrier New Threat Upgrade (NTU) Combat System with the improved Standard Missile Two Block II (Extended Range). Testing lasted from October 1981- March 1985.

New Threat Upgrade allowed the full use of newer Standard missiles (SM-2ER BlkII w/Mk80 booster) and improved the interoperability of the radar, computer, tracking and engagement systems aboard the ships. The system allows the ships to which it was fitted to time share illumination radars for multiple missile interceptions in a manner similar but far superior to the Aegis Combat System. NTU Combat System also allowed full on Engagement of other ships inbound raids while they laid in silent undetected wait to decimate the inbound raid. Many sources affirm and verify that NTU ships were easily combat superior in most respects to Aegis ships of the same era, particularly in the area of tracking and engagement through high jamming environments at nearly double the range of then current Aegis technology. They were inferior to modern Aegis cruisers in that their berthing, messing, and habitability systems were antiquated and needed constant repair.


The New Threat Upgrade to the Leahy class included massive remodeling of the ship from food service space rehabilitation to a main propulsion system overhaul.[1] Entire systems were removed and replaced, for example the AN/SPS-40 air-search radar was replaced with the AN/SPS-49 air-search radar.

In 1988–90, the Kidd-class destroyers received the New Threat Upgrade, including a new superstructure and heavier mainmast cooperative engagement with Aegis Ticonderoga-class cruisers, which could control the Kidds’ surface-to-air missiles while they remained electronically silent. The Spruance class, the predecessor to and close relative of the Kidd-class, did not received the NTU. However, in response to criticisms that the as-designed weaponry was insufficient, 24 members of the Spruances were upgraded with a 61-cell Vertical Launch System for Tomahawk missiles which granted them much enhanced anti-surface capabilities beyond their original anti-submarine warfare mission.[2][3]

End of NTU

The Cold War ended shortly after the New Threat Upgrade was initiated. The lower levels of funding available to the United States Navy after the Cold War meant that the NTU upgrade was never applied to all of the intended vessels. The NTU upgrade itself was expensive, although it still overshadowed the capabilities of the expensive purpose-constructed Aegis warship that was not nearly as capable. Many of these ships were retired in the 1990s whether they received the full NTU modification or not; most of these warships built in the 1960s-1970s had high operational costs and manpower requirements (especially those which were nuclear-powered), compared to newer Aegis warships. The USS Texas (CGN-39) was decommissioned during the upgrade, in the midst of her reactor refueling. USS Gridley (CG-21) received NTU in 1991 at a cost of $55 million but was decommissioned in early 1994. Overall, all US Navy ships that received the NTU upgrades were decommissioned within six years of their upgrade, as the Navy chose instead to order new less capable ships with the Aegis weapon system.

The Navy also accelerated the retirement of the Spruance and Kidd classes, despite their recent modifications, due to the arrival of the Aegis-equipped Arleigh Burke-class destroyers, which were more effective and cost-efficient. The four Kidd destroyers were later transferred to Taiwan (Republic of China) where they remain in service, while some members of the Spruance class remained in service until 2005.

NTU systems

  • AN/SPS-49(V)5 - A 2D Air Search Radar (azimuth and range)
  • AN/SPS-48E - A 3D Air Search Radar (azimuth, range and altitude)
  • AN/SYS-2(V)1 Integrated Automatic Detection and Tracking System (IADTS)
  • (A)CDS - (Advanced) Combat Direction System
  • WDS Mk 14 - Weapons Direction System
  • Mk 74 Tartar[4] and Mk 76 Terrier Fire Control Systems (AN/SPG-55B radar for Terrier ships and AN/SPG-51 for Tartar)
  • AN/SYR-1 Communications Tracking Set,[5] used for SM-2 missile downlink
  • Mk 10 twin-arm manual launcher, Mk 13 single-arm automated launcher and Mk 26[6] twin-arm, automated missile launchers
  • RESS - Radar Environmental Simulator System

NTU ships

These classes had some of their units modified with the New Threat Upgrade.

KDX-II Class

The Navy of the Republic of Korea uses a NTU derived system for its Chungmugong Yi Sunshin class destroyers.

See also


  1. "CG-16". Retrieved 11 September 2014.
  2. "MK-74". Retrieved 11 September 2014.
  3. "AN/SYR-1". Retrieved 11 September 2014.
  4. "MK-26 GMLS". Retrieved 11 September 2014.
  5. "CG-26". Retrieved 11 September 2014.
  6. "DDG-2". Retrieved 11 September 2014.
  7. "DDG-37". Retrieved 11 September 2014.
  8. "DDG-993". Retrieved 11 September 2014.
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