Mercenaries

Fighting Shamrocks

Forewarned Daring

The Fighting Shamrocks camouflage their 'Mechs with a dull motley of grays, greens, and browns.

Per Mercenaries Supplemental 2, page 33.

Other references:
Banshee, Mercenaries Supplemental 2 (color plates)

Color Scheme
Insignia

The unit insignia is a green shamrock with a double outline of scarlet and black. Per FM: Mercenaries Supplemental II, page 33.