 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.After commissioning on 20 July 1960, "Londonderry" completed manufacturer's trials and then was formally taken over by the Royal Navy.She then carried out time in the Home Fleet before departing Portsmouth, Hampshire, UK on 1 May 1961 for her first cruise in the Caribbean area.