The creation of a naval patrol and protection service was one of the first tasks of the government of the newly independent Irish state.
The Coastal and Marine Service was formed under the command of Major General Joseph Vize, an ex- Third Engineer with Clan Line, of Glasgow, on 04 May 1923.
It was made up mostly of ex- Admiralty Armed Trawlers and Patrol Boats but lasted for just over a year.
Between then and WW2 the service was allowed to dwindle to 2 active fishery patrol vessels.
In January 1939, a Coast Watching Service was established to monitor Irish coastal waters and a series of motor torpedo boats was ordered. This wartime fleet consisted of 6 MTB’s, 2 fishery patrol vessels and a few obsolete auxiliaries.
The official name, “Irish Naval Service”, was adopted when the government confirmed the wartime service to be a permanent component of the Defence Forces, on 15 March 1946.