Donegal 'Mechs and vehicles use a blue-grey paint scheme.
Per FM: Lyran Alliance, page 62.
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 insignia of the Eleventh shows a pair of 'Mechs, one a Commando and the other an Atlas, engaged in a game of tug of war. Per FM:Lyran Alliance, pages 62 and 70.