History of the Irish Naval Service started, and the ships were named "Cliona", "Maev" and "Macha". 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. Between 1968 and 1970, Cliona, Maev and Macha were withdrawn from service. These were replaced by three minesweepers commissioned in 1971: Grainne, Banba and Fola. In 1971 the Naval Service commissioned Verolme Cork Dockyard to build an offshore patrol ship. Named L.É Deirdre, it was the first naval vessel purpose-built in Ireland
Structure of the Royal Navy in 1989 affiliated with universities and in 2018 were under the jurisdiction of the Commodore, Britannia Royal Naval College. 14 URNUs had been founded in 1967 and the late 1980s each URNU received one Archer class patrol vessel as dedicated training vessel. However, as four of the 14 Archer vessels went to the Royal Naval Auxiliary Service it is unclear how many URNUs were still active in 1989. The Flag Officer Reserves was a Rear Admiral based in Whitehall, who was responsible for recruitment and training of the Royal Naval Reserve. Each Royal Naval Reserve Division had one River-class minesweeper from the