The rapid increase in the use of helicopters in the Royal Navy in the late 1950s and 1960s required an increase in the training and support facilities ashore and afloat. Operational training for aircrew was carried out by naval air stations at Portland and Culdrose. The scrapping of some carriers and conversion of others to commando carriers in the mid-1950s left a shortage of suitable decks. This led to the ordering of in 1964; however she would not be available till 1967. In the meantime it was decided to convert "LST 3027" to serve as an interim training ship.