When you pause the game you need to scroll right and go down to appearance. There you can change your armor type, color, and emblem. Note that you can only change it on the title screen and that it only shows up in multiplayer mode.
You can get a shield in Halo but you have to search for it and it doesn't last long and of your asking for extra armor pieces I have no clue :^)
If you are asking how you change your armor, your emblem and colors for then press start go right and then go down to 'Change Appearance' and then change it all from there.
you go to menu then click attire then you'll realize that all i said was a bunch of bull cuz i don't even have halo3.
When you are on the Reach game press the start button on your controller. Go right to Amour. All the options are right there.
On the menu hit start and scroll right until you find appearence. You can't change armor but you can change characters for firefight mode.
you can customize your character in halo 3. and you can change your character that has different armor in halo 3:odst
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.
go to http://hubpages.com/hub/Halo-3-Armor
Halo 3 I'm guessing Start, Right, Down, A. That'll give you the ability to change your color, armor, emblem etc.
you get all the vidmaster achievements on halo 3 and halo 3 odst
NO
recon armor
Only the color of the armor.
the same way in halo 3 because when you play halo 3 mythic it says your playing halo 3
there is no permanent cheats in halo 3. you need to unlock them by achievments. and, you can not get the flaming armor effect, it is only for bungie employees. in halo reach, buy the legendary package to get that armor effect.