The Fifth uses a variant of the Guards' paint scheme, adding black and white highlights to their 'Mechs and vehicles.
Per FM: Lyran Alliance, page 66.
Stiletto, RS: 3067 (cover)
Zeus, FedCom Civil War (cover)
Chimaera, Shadow Cat, Cougar, Battle Cobra, Uziel, CB: Miniatures Rules (p 7)
Madcat Mk II, Thanatos, CB: Miniatures Rules (p 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 unit insignia depicts a bulldog smoking a cigar. Per FM:Lyran Alliance, pages 62 and 66.