Irish Naval Service as a permanent component of the Irish Defence Forces. The Naval Service purchased three s from the United Kingdom in 1946 and 1947. The tradition of naming Irish Naval Ships after figures in Celtic Mythology began, and the ships were named , and . These three ships were to become a key part of the Naval Service in the 1950s and 1960s. The first formal training of Irish naval cadets took place at the Britannia Royal Naval College, Dartmouth, UK in 1947. In 1970, "Cliona" and "Macha" were withdrawn from service and scrapped, leaving "Maev" as the sole ship in
Royal Naval College, Greenwich building. The Navy's Department of Nuclear Science and Technology opened on the college premises in 1959, and JASON, the department's research and training reactor, was commissioned in the King William building in 1962. In 1967 Queen Elizabeth II knighted Francis Chichester on the river steps of the College, honouring his achievement in circumnavigating the world as a solo yachtsman, using the old route of the clippers, becoming the first to do so. His was also the fastest such circumnavigation, taking nine months and one day. The Royal School of Naval Architecture, which had been part of the College since 1873,