The only way to get all the armor variants is to unlock the achievement for that armor or meet a certain requirement. For example getting all the skulls on the campaign unlocks the hayabusa armor variant for your spartan. Also beating the game on diffrent difficulties unlocks new armor sets for you.
http://hubpages.com/hub/Halo-3-Armor
go to http://hubpages.com/hub/Halo-3-Armor
you get all the vidmaster achievements on halo 3 and halo 3 odst
No.
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
There is no glitch.
By getting skulls.
There is no cheats.
get all skulls
To get security armor in Halo 3... all you have to do is get all of the original 49 achievements (you don't need the new mythic or legendary achievements).
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.
All in halo 3 and all in Halo 3 ODST.