Something interesting. I just went from Lt Commander to Post Commander.
Now some on these boards have posted that that's the highest rank, but I'm wondering if that's the case. What was interesting is it's the first time the Feds actually gave me a congratulatory message and said that it was a "field promotion" That makes me wonder if it's not the highest rank but rather the first of the true officer ranks.
This is supposition on my part, but AFAIK in RL everything below Warrant Officer is a non-commissioned officer - an NCO. Also in RL a Post Commander is equivalent to a Colonel or a Navy Captain. Given the size of the Federation fleet I's be very surprised if there were not Brigadiers, Generals of various stars and/or Admirals/Grand Moffs etc.
Also if Post Commander were the highest rank it would mean that there were fewer ranks in ED than in FE which would be a backward step.
Iff my supposition is correct then it give credence to the idea that there might be more rank locked stuff to find.