| Re: Fictional Military Ranks I think you have a fascinating opportunity ahead of you to (a) structure your Space Command, whether military or non-military in its origins, and (b) show us how you've worked out what to call everybody.
I don't know if this fits at all with your plans, but if you have a character who rises through the ranks within the timeline of your story, you can show us how the various ranks came about, what their origins are and why the Space Corps has elected to use them.
Beyond that, I have no real suggestions other than to be etymologically logical about your choices. |