Sci Fi Military: Something new, or a retread of modern military?

This seems to be a controversy, which is this:

Sci fi military, is it going to be evolved and different or a retread of what we have now?

Certain things will always make sense, like that you must have hierarchy in military commands, and only one person ultimately in charge. I don’t think that can change, at least for humans. When people buck this particular nugget of wisdom, you end up with military disasters. Command by committee = Vietnam.

As for the actual composition, you would be hard pressed to find something alternate to an officer/nco/enlisted ranking structure. That’s been around for 1000s of years.

Romans | Modern
miles        private
optio         sergeant
centurio    lieutenant
legate       colonel

Without organization, you have a cluster of people who fight as individuals, and that’s not a military. Or, not an organized one.

The proposed changes stem from an idea that mankind will evolve. [Haven’t any evidence of this, so it’s unlikely.]

Absent some sort of coercive behavior, most people aren’t strongly motivated to fight. Thus, hierarchy.