However, High Command's leader is still going to remain: The Smoking Man, aka shadowy figure.
Here is my revision.
Governor-golden wreath
Admiral-insignia-4 stars
Vice Admiral-3stars
RearAdmiral(upperlvl)-2stars
Commodore
Captain-eagle
Commander-Silver leaf
Lt.-double bar
Sgt. - Silver bar
Ensign- gold bar
Cadet- No symbol
What do you think?
My suggestion is that sergeant is an Army term for a non-commisioned officer and contradicts an officer's insignia. Possible solution, remove sgt. and move ensign and cadet up one rung.