You simply have to reach the appropriate ranks. The Elite armor does not cost any extra cR.
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We can not answer. You must have had to pr order halo reach to get elite officer armor.
Yes, it is possible to get all of them, excluding the one that was released for the Limited and Legendary Editions
granadier
his helmet is a grenadier
Grenader you can veiw it when you are Warrent Officer but you must be like Captian to be buy it also i think you need like 4000cr for it