The primary roles of the Irish Coast Guard (IRCG) include maritime safety and search and rescue.
The Irish Search and Rescue Region, which includes most of the Republic of Ireland and some parts of Northern Ireland, is the area over which the Coast Guard has responsibility.
The IRCG operates five Sikorsky S-92 Search and Rescue.
These five helicopters have the registrations EI-ICG, EI-ICU, EI-ICA, EI-ICR, EI-ICD – with the last letter of each registration spelling out "GUARD".
As of late 2016, the S-92s were deployed as: Callsign Rescue 118 operating from Sligo, Rescue 117 operating from Waterford, Rescue 115 operating from Shannon, and Rescue 116 operating from Dublin.
Each of the five aircraft are rotated between the four rescue teams, with one spare aircraft.
In March 2017, RESCUE116 (EI-ICR, providing cover for another Coast Guard helicopter) crashed off the coast of County Mayo.
Captain Dara Fitzpatrick was recovered from the water on 14 March in a critical condition, and transferred to Mayo University Hospital where she was pronounced dead.
As of 22 March 2017, Dara Fitzpatrick's three colleagues remain missing.
Reference: Wikipedia