Three large masts were also installed in order to hold a variety of radars, missile guidance, and communications systems. During the two year refit under project SCB 146, the aft superstructure was completely replaced and all aft guns were removed to make room for the twin-arm Terrier launcher and a 120 missile storage magazine. Originally built as Cleveland-class light cruisers (CL) in the United States Navy during World War II, in 1957 three ships were re-designated as Providence-class guided missile light cruisers (CLG) and fitted with the Terrier surface-to-air missile system. 1 × dual Mark 9 RIM-2 Terrier missile launcher.
