No, only elite's.
you have to complete halo 3 odst on legendary, have xbox live and complete halo 3 on legendary
I'm afraid that you cannot be a brute in halo 3.
no
http://hubpages.com/hub/Halo-3-Armor
No, there is no armor in Halo 3 that has a knife in the shoulder.
you dont
You can't.
You cant. Its not a game option.
kill a brute cheiftan
go to http://hubpages.com/hub/Halo-3-Armor
you get all the vidmaster achievements on halo 3 and halo 3 odst