 A Type 993 surface/air-search radar replaced the existing Type 293Q radar, while the ship's defences were enhanced by the addition of the Corvus chaff rocket dispenser.In the spring/summer of 1961 "Rothesay" was in Halifax, Nova Scotia and was intending to make courtesy calls at ports on the eastern seaboard of the United States but was instead diverted to Bermuda where she was to stay ready to protect British interests in Cuba.On 21 March 1962 she accidentally rammed the Turkish in the western Mediterranean (off Gibraltar) during the NATO exercise "Dawn Breeze".