First off the top of my head...
Tanfen Homeguard trooper
Standard uniform is a jumpsuit done in khaki and brown. Multiple pockets. Heavy Huey pilot style helmet. Often wears body armour in high security areas. The most numerous of the Corps security personnel Average training. Standard doctrine: Shoot first, shoot often, shoot last. When in doubt, overkill is acceptable. Symbol of Homeguard is a shield bisected with red, green, and blue.
Sky grey uniform, and beret. Family Lai personal guard. Weapon of choice is a vibro or shock lance. Emotionless, and cold under fire. Trained as mechanised shock troops. Prefer ranged combat and set piece battles. Incredibly high morale. Very logical and educated. Will weigh pros and cons before committing to a battle.
Blue beret and royal blue uniform. Defensive troops and special purpose units. Trained primarily for defense. Family Gan loyal troops. Standard training as combat engineers. Skilled with technology.
Similar HG uniform, without armour. Cynical and pragmatic. Symbol of flying pegasus. Operates in defense of corporate assets and convoys. Good training, indoctrination turns them into implacable enemies. Heavily decentralised command structure leads to flexibility but impedes grand strategic initiatives.
Porhen Sekuritat Cadre trooper:
Cheap, expendable. Trained in the hundreds. Given substandard weapons or demo charges and employ human wave attacks. Those guarding public places given slightly better training. Black and dark grey coveralls. Officers wear slightly better armour and are normally mercenaries called Bravos. Not very highly regarded in the Corp.