Mercenaries

Gael's Grinders

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)

Color Scheme
Insignia

The Grinders' insignia is a BattleMech's foot crushing an hourglass into the ground. Per FM: Mercenaries Supplemental II, page 35.