I just input a code for "Oni 1" and way point froze violently.
It unlocked an emblem? Okay thanks 343 forums.
Here's the codes go into waypoint > classified > raider set > press X then input the these codes. All you gotta do is make sure you beat chapter 1 and 2 for these to work, it's not possible to unlock 3 yet until 343 releases another of their cryptic messages that their forum destroys in 10 minutes.