I imagine there would have been Catholic chaplains with any Irish regiments, but not all Irishmen were in specifically Irish regiments.
I'm particularly interested in hearing about any Jesuit chaplains in Korea. One Jesuit-related website mentions that there were some, but doesn't give any details.
The specific circumstance I'm writing about is that of a British Jesuit who saw the fighting at Imjin, where the 1st Gloucester battalion (the Glorious Glosters) was taken prisoner en masse. At first I had him with the Glosters, but the Glosters had a very famous Anglican chaplain of their own who went to prison with them, and it doesn't seem quite fair to detract from that unless the Catholic happened to have been visiting the Glosters and been caught up in their "last stand." (A possibility I'm still considering.) But there were two other British battalions and one Belgian, and it doesn't seem impossible that they might have had Catholic chaplains at least visiting. (The viewpoint character I am writing about wasn't taken prisoner, he was wounded and left for dead, and fortunately rescued. So his perspective is that of having witnessed this whole battalion vanish into thin air--"and I alone am escaped to tell thee," etc.)
Of course I'd love to hear from anyone with personal information, but I'm thinking more right now of sources to go to. If it's a book on the Glosters, or a website about or touching on military chaplains that can be brought up by a simple search ("jesuits korean war", etc.), I've probably already seen or heard of it. Search term suggestions are welcome, as are confirmations of existing information in any books on the Korean War and/or the British therein--but preference will be given to information the supplier knows is there. Historical websites about the British in Korea are welcome and especially if they include the opportunity to ask questions. Likewise websites about Jesuits, military chaplains, etc., IF one can ask questions--otherwise their information is apt to be anecdotal.