I am in the Halo 3 Spartin officer ranks, but rogue armor didn't unlock?

[Raj R]

If i click on my gur and look at the service record I am a lieutenant grade 2 because of ranking up with the highest skill achieved, i went to customize my guy and the rogue armor wasn't their, and I also didn't get the achievement..why is this happening? what do i do now?

 

[Spencer]

are you sure your guy is a lt grade 2? you cant just be a lt grade 2 in the new ranking system. your overall character needs to be a lt grade 2