No , its just a hack or a mod that people can do.
You have to download a mod, there is no halo armor in the game itself.
If you have it on xbox 360 you can't get it, thou if you have it on PC continue to read, if you want to get it search it up on google on gamespot i think they have it just type in like "Oblivion PC Mods, Halo Armor" and you should get it
It is either leather/steel or quest\enchanted armor or blades armor
Mods.... search halo armour oblivion
No, only with the help of a mod (modification).
I really do not know
YEZ! real halo armor at ebay.com
by using cheats i guess but you can only use cheats on the computer version unless you are counting the duplication gliches as cheats but that has nothing to do with getting halo armour so i think it is only cheats on the PC OK
No, in Halo 2 you can not unlock armor.
http://hubpages.com/hub/Halo-3-Armor
No, there is no armor in Halo 3 that has a knife in the shoulder.
There is no Brute armor in Halo 3, only Elite and Spartan models.