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In 1983, the USS Mahan (DDG-42) was underway to test and evaluate the Terrier New Threat Upgrade (NTU) Combat System.

New Threat Upgrade (NTU) was a program to improve the Anti-Aircraft capability of Terrier and Tartar ships. It allowed the use of newer Standard missiles and improved the interoperability of the radar and computer systems aboard the ships. Some sources indicate that NTU ships were superior in some respects to Aegis ships of the same era (particularly in the area of user interface). Despite this claimed superiority, the age of most the NTU ships made them expensive to maintain. As a result, the United States Navy no longer fields any NTU capable ships and most newly constructed ships have the Aegis weapon system.

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. The upgrade was also quite expensive and the ships modified didn't serve much longer after the modification. For example, USS Gridley (DLG-21) received NTU in 1991 at a cost of $55 million but was decommissioned in early 1994.

• AN/SPS-49(V)5 - A 2D Air Search Radar (Bearing and range)
• AN/SPS-48E - A 3D Air Search Radar (Bearing, range and height)
• 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[2] 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[3], used for SM-2 missile downlink
• Mk 10 twin-arm manual launcher, Mk 13 single-arm automated launcher and Mk 26[4] twin-arm, automated missile launchers
• RESS - Radar Environmental Simulator System

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

• Belknap class cruiser[5]
• California class cruiser
• Charles F. Adams class destroyer - Planned to be upgraded, but cancelled.[6]
• Farragut class destroyer (1958) - Planned, but only USS Mahan (DDG-42) was upgraded as a test platform in 1982.[7]
• Kidd class destroyer[8]
• Leahy class cruiser - All upgraded in the late-1980s and decommissioned by 1995.
• Virginia class cruiser

The Cold War ended shortly after the expensive New Threat Upgrade occurred and all ships that received the upgrades were decommissioned shortly following their upgrade. The USS Texas (CGN-39) was decommissioned during the upgrade.

Standard missile