Deep in a cavern along the Northern Defences in Gibraltar is an unassuming piece of graffiti. Written in pencil, and dated 1968, a soldier named McCULLOUGH left his name and regiment indelibly on the Gibraltar rock. The regiment was the Royal Ulster Rifles. The date is significant, because not long after this was written, RUR would be amalgamated with the only other two remaining Northern Irish infantry regiments,; The Royal Irish Fusiliers and The Royal Inniskilling Fusiliers, to form The Royal Irish Rangers.