Okay, I was trying to get the armor I love so much back into my possession. I have 1000 GS in Halo and 49 achievements. Don't say you need the original 49 because I know you don't. I had it unlocked when I hit 1000 gs but it relocked itself shortly after.
It could be an update. But more likely its a glitch. Some times its certain achivements that you need it happend to my bro he had like 1000 somethin gamer score and still no security. Then he got like 2 achivements and he had it.
Damn, because I had just had it unlocked again, played a game with it and then it relocked. I read on Halopedia that the armor is glitchy.