halo 3 security armor glitch?

[TIM]

I have 1055GS in halo 3 and I use to have the security shoulders now I do not have my shoulders and I should have had my katana and my helmet but I do not. I have marathon man and alot of old achievement but I have some new ones to

 

[Bob S]

that has happened to me before i had the armor for a few day then it just went away. i think it is because of all the new achievment updates that are just messing them up

 

[Bob S]

that has happened to me before i had the armor for a few day then it just went away. i think it is because of all the new achievment updates that are just messing them up

 

[Josh F]

HERE'S THE ACTUAL ANSWER TO YOUR PROBLEM

Security shoulders are riddled with glitches, they usually unlock and re-lock themselves with every other achievement you get above 750 gamerscore.

As for your missing katana / Security helmet, the reason you don't have them is because you do indeed have 1000 gamerscore in the game, but you need 1000 gamerscore and 49 achievements in halo 3 to unlock security and katana.