That armour on them is from some NCR heavy troopers. If they killed that many bos we would know it. In lore a western bos guy would slap a Centurion back to the year 2 AD.
I got bos down at the dam, and the part they were defending cl never even made it out of the door. They opened the door and it was lights out ashes and bodies.
GET ME A BETTER BAD GUY GROUP!!!!!!!!!!!!!