Mercenaries

Grim Determination

The Misfortunes of War

paints its 'Mechs and other vehicles in camouflage that fits the environment of its current assignment.

Per Mercenaries Supplemental, page 34.

Other references:
Grand Titan, Mercenaries Supplemental (color plates)

Color Scheme
Insignia

The regimental insignia is a turtle with an SRM launcher on its back. Per FM: Mercenaries Supplemental, page 34.