The 4th/6th (County Fermanagh and County Tyrone) Battalion, Ulster Defence Regiment was formed in 1991 as a result of an amalgamation between the 4th Battalion, Ulster Defence Regiment and the 6th Battalion, Ulster Defence Regiment. The resultant 4/6 UDR was subsumed into the Royal Irish Rangers in 1992 as part of the amalgamation which formed the Royal Irish Regiment.
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