In my book series, I'm hoping to somewhat plausibly portray the operations and structure of a space-based military force. One of my big pet peeves with much contemporary space opera is the automatic transplantation of naval ranks and terminology to an outer space setting. To me this represents a massive failure of imagination on the part of the authors in question, and it makes the entire setting and narrative seem just plain silly. A few authors, such as Frank Herbert, have tried to break from this trend by coming up with entirely new ranks, but even here one can usually see that they're simply cannibalizing terminology from history books. I'm hoping that I can create a believable rank structure used in military space forces several centuries in the future and also work out the back-story of their evolution over time. This is a significant challenge, because my military knowledge is minimal, and I'm having a hard time finding literature that deals in any meaningful way with the evolution of military organizations. All I've been able to come up with so far is replacing the term "Private" with the term "Ordinate" (derived from "subordinate"). Does anyone have any reading material on this subject they'd recommend?