The highest rank you can reach is 46.
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The highest rank in Halo: Reach is Inheritor.
You can reach rank 44.
The Sangheili Councilor is the highest attainable rank, however the Arbiter is more religiously significant.
Commander Helmet. Unlocked after you reach the Commander rank. Rank is currently capped at LT.Cornel Grade 3, Commander is the next rank.
It is Colonel