The original cairn commemorating three part-time members of the UDR (which can be seen in Carrickfergus RIR/UDR) – Henry Russell, Steven Carlton, and Walter Kerr – was replaced by a new obelisk in 2017. The medal in the middle is the Conspicuous Gallantry Cross, which was awarded to the entire RIR and UDR in 2006. (The UDR was merged with the RIR to form the Royal Irish Regiment in 1992.) (Video of the launch.)
Cyril Smith was a Catholic from Carrickfregus and a Royal Irish Ranger. The original cairn in his memory tells the story of his death at age 21 in 1990. For commentary, see this Irish Times piece.
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