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