5th (Extra Reserve) Battalion, Royal Irish Rifles.
Regular Army Reserve Battalion.
The Commonwealth War Graves Commission has 40 recorded WW1 deaths for the 5th (Extra Reserve) Battalion, Royal Irish Rifles.
McCAMMON, T.V.P. Lieutenant Colonel. 5th (Etra Reserve) Battalion, Royal Irish Rifles, Attached To :- 2nd Battalion, Hampshire Regiment. etaples Military Cemetery, Pas-de-Calais, France. 28-04-1917. Son of Colonel Thomas McCammon (5th Battalion, Royal Irish Rifles). Husband of C.A. McCammon of Helen's Bay, County Down, Ireland. Native of Hollywood, County Down. Served in the South African Campaign.
Colonel T.V.P. McCammon, Woodville, Holywood, Co. Down, died in France from wounds received in action. He commanded until recently a reserve battalion of the Ulster Division, to which he succeeded from the 5th Royal Irish Rifles. He was subsequently ordered overseas and posted to a Hampshire battalion. Colonel McCammon was born on the 27th October, 1874, his father being Col. Thomas Andrew McCammon. Having received his education at Cheltenham College, he was gazetted Second Lieutenant of the 5th Battalion Royal Irish Rifles (Royal South Downs) in November, 1891. When the war broke out in South Africa he volunteered for active service, and served with the 2nd Battalion Royal Irish Rifles. He was the possessor of the Queen's South African Medal, with two clasps.
This is from the excellent website "Our Heroes" with my thanks.