Live to Fight Another Day
The Grinders paint their machines in greens commonly seen on Liao units, accented by Capellan insignia.
Per Mercenaries Supplemental 2, page 35.
Other references:
Firestarter Omni, Mercenaries Supplemental 2 (color plates)
The Grinders’ insignia is a BattleMech’s foot crushing an hourglass into the ground. Per FM: Mercenaries Supplemental II, page 35.