First Character, Lightweight Leather armor and Legion Centurion Helm
Second Character, full NCR ranger gear
Last Character, Caesars Armor and Legion Centurion Helm
I single handedly annihilated Caesars Legion. hahahaha
All you hav to do is obtain a ballistic fist, dress as a legionary, use a stealthboy, and pick everyone off one by one. If you get caught, leave the area, then re enter. stupid ass AI will forget about you since you're dressed as a legionary lol. repeat till every mother fucker at the fort is smashed to pieces.