In addition to corrections by Limbic~Region, et. al., here are a few more, from the perspective of the US Army:
Personally, I never made it beyond E-5 (Sergeant) but my brother recently pinned on his Colonel (O-6) eagles! A good day for him. :)
In reply to Re: Translate military paygrades to rank salutations
by ptum
in thread Translate military paygrades to rank salutations
by girarde
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