The regiment that the 6th Battalion, Ulster Defence Regiment grouped into had who as their oldest predecessor?
6th Battalion, Ulster Defence Regiment The 6th (County Tyrone) Battalion, Ulster Defence Regiment (6 UDR) was formed in 1970 as part of the seven original battalions specified in The Ulster Defence Regiment Act 1969, which received Royal Assent on 18 December 1969 and was brought into force on 1 January 1970. It was, along with the rest of the regiment, amalgamated with the Royal Irish Rangers in 1992 to form the Royal Irish Regiment.
16th/5th The Queen's Royal Lancers The 16th/5th The Queen's Royal Lancers was a cavalry regiment of the British Army. It was formed by the amalgamation of the 16th The Queen's Lancers and the 5th Royal Irish Lancers in 1922 and, after service in the Second World War and the Gulf War, amalgamated with the 17th/21st Lancers to form the Queen's Royal Lancers in 1993.