New Threat Upgrade (NTU) was a United States Navy program to improve the capability of ships equipped with Terrier and Tartar anti-aircraft systems. 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. This New Threat Upgrade system made USS MAHAN the most capable AAW ship afloat. New Threat Upgrade allowed the full use of newer Standard missiles (SM-2) and improved the interoperability of the radar and computer 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 to the Aegis Combat System. Some sources indicate that N