When you get there (or fast-travel to the place) turn to your left and you will see a bunch of camps and a guard post which is guarded by a NCR ranger. If you haven't discovered it yet, it is a little bit to the north of the “Brotherhood of Steel Bunker” map marker, which will appear on your pip-boy since the beginning of the game. The map marker is at the east-most part of the map. First, what you have to do is, pop that pip-boy and go to NRC's Camp Forlorn Hope.
With a little metagame you can get that combat armor in no time. But is worth killing NCR ranger and getting on the bad side of the NCR just because of it? Probably not too. Still, that armor is almost ten times baller than any other armor in the game, but, is the sacrifice of your characters ideology worth the price of the item? Probably not. NCR has one of the coolest armors in the game, yet you may not agree with their philosophy and their geopolitical presence.
