Well, I did find free armor but it is pretty annoying to get.
I prefer you right it down.
*IMPORTANT* you must download Halo waypoint to access this.
[url=http://www.gamefront.com/halo-4-secret-waypoint-codes-raider-armor-unlockables/]Enjoy the armor :)[/url]
[Edited on 11.10.2012 9:16 PM PST]
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The codes work. Just make sure you've completed Spartan Ops, and the Oni and Wiseguy codes you need to find all of the terminals, those give you I think 7000xp in game. Which is pretty nice :)