President Michael D Higgins and Taoiseach Enda Kenny were among the attendees at the National Day of Commemoration ceremony in Dublin today.
The military and religious ceremony was held in honour of all Irish men and women who died in war or on service with UN peacekeeping forces.
A minute's silence was held after Mr Higgins laid a wreath.
The Air Corps performed a flypast at the event at the Royal Hospital Kilmainham.
The Presbyterian Church in Ireland was represented by Dr Michael Barry at the commemoration.
Dr Barry took part in a christian act of worship, in which he read from the Bible.
Speaking afterwards he said: "Today's ceremony comes in a year when we have remembered many significant events in the history of the island of Ireland and its people.
"This is an annual service, which I first took part in two years ago. It has been an honour to represent the church once more at this significant act of remembrance in the life of the State in which Presbyterians play their part today, as their forebears did one hundred years ago."
Ceremonies were also held in other parts of the country.
Veterans in Royal Hospital Kilmainham this morning for the National Day of Commemoration pic.twitter.com/DgPrtqbni5— Irish Defence Forces (@defenceforces) July 10, 2016