The Com Guards simply paint their vehicles white for official occasions and use appropriate camouflage for combat.
Per FM: ComStar, page 17.
Raijin, CB: Miniatures Rules (p 23)
Marauder, Battle of Tukayyid (p 173)
Mercury, Battle of Tukayyid (p 178)
The insignia of the Seventh Army shows a dark blue wave on a grey disk. Per FM: ComStar, page 32.