This mini was painted with Delta Cadet Grey, washed with Citadel Black Ink, with Delta Charcoal Grey accents.
The Legion’s trademark gray skull insignia is set over a red crest and emblazoned on the left shoulder of unit ‘Mechs. A colored circle painted on the lower right leg identifies the battalion; yellow for first battalion, green for second, blue for third, and red for the Headquarters Company and regimental command lance. On the right shoulder, a warrior may paint a special unit crest (usually a company insignia). The two command units wear the Legion insignia on both shoulders.
Per FM:Mercenaries, page 56.