Mercenaries

Head Hunters

Sword of Orloff

The Head Hunters paint their BattleMechs using desert tan on the legs and lower torso, and the upper torso, arms and head in an olive-drab green.

Per Mercenaries Supplemental, page 38.

Other references:
Cronus, Mercenaries Supplemental (color plates)

Color Scheme
Insignia

Their insignia is a blazing white skull with gold shining eyes set atop crossed silver swords on a purple disc. Per FM: Mercenaries Supplemental, page 38.