 Vessels of the "California"-class cruisers, "Virginia"-class cruisers and "Kidd"-class destroyer had their Tartar systems upgraded to modification 14 or 15 standard which enabled them to employ the Standard Missile 2 as part of the New Threat Upgrade (NTU) program.The New Threat Upgrade equipped vessels could utilize the inertial guidance systems on the SM-2 and time share illumination radars for semi-active homing in the terminal phase of the intercept, increasing the number of targets the Tartar system could attack at the same time.The New Threat Upgrade Tartar ships could function nearly as well as Aegis Combat System equipped vessels, except for dealing with saturation missile attacks.