6th Battalion, Ulster Defence Regiment was amalgamated to form part of what army? 
6th Battalion, Ulster Defence Regiment:  It was, along with the rest of the regiment, amalgamated with the Royal Irish Rangers in 1992 to form the Royal Irish Regiment. Royal Irish Regiment (1992): The Royal Irish Regiment (27th (Inniskilling) 83rd and 87th and Ulster Defence Regiment) (R IRISH) is an infantry regiment of the British Army.
British Army