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 Between 1968 and 1970, Cliona, Maev and Macha were withdrawn from service.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
Royal Naval College of Canada building was heavily damaged in the 1917 Halifax Explosion. In the Spring of 1918, the college was temporarily moved to facilities at the Royal Military College (RMC) in Kingston, Ontario. In September, the college was relocated to the naval dockyard at Esquimalt, British Columbia. The college was closed in 1922 after a parliamentary decision. The King’s permission was obtained to add the prefix 'Royal' to the title of the Naval College of Canada in October 1910, with the abbreviation being 'R.N.C.C.' The naval college was established at Halifax, Nova Scotia in 1911. RNCC was co-commanded by Lieutenant Commander Edward Atcherley