The Com Guards simply paint their vehicles white for official occasions and use appropriate camouflage for combat.

Per FM: ComStar, page 17.

Other references:
Warhammer, Battle of Tukayyid
Highlander, Battle of Tukayyid (p 178)


Insignia:

The insignia of the Eleventh Army shows two warriors duelling with rapiers. Per FM: ComStar, page 40.