Two of those later convicted ( James McDowell and Thomas Crozier ) were also serving members of the Ulster Defence Regiment ( UDR ) locally recruited regiment of the British Army .
The Ulster Defence Regiment ( UDR ) is a part - time .
Two of those later convicted ( James McDowell and Thomas Crozier ) were also serving members of the Ulster Defence Regiment ( UDR ) , a part - time , locally recruited regiment of the British Army .