The Sixth uses the standard blue-gray paint scheme of the Donegal Guards, but individual Mechwarriors often customize their machines, overlaying a pattern of swirling lines in a Celtic motif.
Per FM: Lyran Alliance, page 67.
Exploiting their old Earth ties to Ireland, the Donegal Guards use a shamrock set on a dark red square as their insignia. On Donegal 'Mechs and vehicles the Guards insignia appears on the right shoulder or side and the insignia of the unit on the left. The regimental insignia depicts a white hawk surrounded by interwoven vines. Per FM:Lyran Alliance, pages 62 and 67.