Black and red are the official colors of the Kell Hounds.
Per FM: Merc (revised), page 77.
Nightstar, CB: Miniatures Rules (p 25)
Wolfhound, FM: Mercenaries (plate 15)
Shadow Hawk, CM: Mercenaries (p 22)
Commando, CM: Mercenaries (p 108)
Annihilator, CM: Mercenaries (p 113)
Their formal insignia is a black hound’s head set against an inverted red triangle. The insignia is painted on the left torsos of the command’s BattleMechs, left wings of fighters and the left fenders of vehicles. The Unit Command Lance bears no special insignia apart from the standard Kell Hound logo. The First’s insignia is a black leash and broken dog collar studded with spikes, and is painted on the right arms of the regiment’s BattleMechs. Battalion insignias, if any, are painted on the lower left legs of ‘Mechs or on fighter afterburners. The Second Regiment’s insignia is a large black hound in mid-leap, half-framed by a red star. The insignia is painted on the right shoulders of the unit’s BattleMechs. Battalion and squadron insignia are painted on the lower left legs of BattleMechs and the afterburners of fighters. Per FM:Mercenaries Revised, page 77-80.