Relatives of all those who lost their lives are expected at the emotional ceremony.
The celebrants will be Catholic Bishop Dr Philip Boyce, Church of Ireland Bishop Dr Ken Good, Presbyterian Moderator Dr Brian Brown and Methodist Moderator Rev Ian Henderson.
Special tributes are to be made recalling the sacrifices made by the men and women who died.
The government will be represented by new Junior Minister for the Gaeltacht Dinny McGinley.
The service is being coordinated by the Journey of Remembering Partnership.