Mark V locked forever?

I have all the spartan and elite armor in halo 3 except the mark v helmet. I cant unlock the unsc spartan achievement even when i was sergeant. I even tried doing the vidmaster lightswitch but that didnt unlock the helmet. Can anyone help?

This should help.
Yes, I know, that Halo Nation is not always reliable, but I prefer it over any other.

> 2533275010817669;2:
> This should help.
> Yes, I know, that Halo Nation is not always reliable, but I prefer it over any other.

I know i need the unsc spartan achievement but it won’t unlock

Have you definitely met the requirements? You need 50xp in a playlist.

> 2533275010817669;2:
> This should help.
> Yes, I know, that Halo Nation is not always reliable, but I prefer it over any other.

Excuse me? Halopedia?

> 2533274991067213;5:
> > 2533275010817669;2:
> > This should help.
> > Yes, I know, that Halo Nation is not always reliable, but I prefer it over any other.
>
> Excuse me? Halopedia?

I said I PREFER it over any other. Preference ok?
Also, I was supposed to say this yesterday, but Waypoint decided to drink and I’m having trouble to navigate though the site.

> 2533274912044273;4:
> Have you definitely met the requirements? You need 50xp in a playlist.

I have 50xp on lone wolves but nothing unlocked