You get it when you reach commander.
You unlock the Grenadier Shoulders at the rank of Colonel, they cost 65,000 cR.
It is unlocked at the rank of Colonel on Halo: Reach and costs 1,200 CR
The highest rank in Halo: Reach is Inheritor.
You have to be an warrant officer in halo reach to unlock the helmet you also have to go to halowaypoint and unlock the armor.
Inheritor is the maximum rank so far in halo reach
Rank up to Lt.col in halo reach
You try and get another rank
Rank up. There are no shortcuts.
It's a rank.
Inheritor.
you need to be the rank of captain
I am pretty sure it is a inheritor.