you can buy it
no you need to get skulls and certain achievements
http://hubpages.com/hub/Halo-3-Armor
No, there is no armor in Halo 3 that has a knife in the shoulder.
recon armor
There is no Brute armor in Halo 3, only Elite and Spartan models.
go to http://hubpages.com/hub/Halo-3-Armor
The Crystal Armor is just a fake, you cant get it.
ODST and Mark V armor are the ones.
god armor is armor #3 the mime costume
the prototype T-51b power armor in Fallout 3 is designed just like normal T-45d power armor but it does not sacrifice agility for armor rating and rad resistance.
All the armor are the same it's just the way how you want to look WRONG! the best armor in halo 3 is the recon armor and you have to be a member of bungie OR get all 7 vidmasters in halo 3 ODST
NO
Recon Armor is now released to everyone