Awesome game Idea.

[Godfather Lorenzo]

Okay, Wall of text incoming:
Huge RTS/FPS style game, MMO kinda thing
Army based, Players all are in FPS mode, but, Officers, not Field Officers, stay in HQs and Field HQs with a computer screen transferring them into an RTS mode allowing them to tell where the human controlled infantry soldiers.
In Ranked games you earn experience improving your rank and only people of the required rank can take certain roles.

[Cuckoo]

Well, that's one short wall.

[Nathaniel Hawk]

Play Empires Hl2 mod it's got a similar idea in that 1 player plays it as an rts where as the others are the infantry

[Godfather Lorenzo]

Empires sucks dick, I'm not talking, 20 players, I'm talking hundreds or even thousands of players on the same battlefield, a fifth probably being Officers, no respawns btw.

[Cuckoo]

One, you can't rely on having hundreds of players on each server. At all.

Two, the graphical capability and processor speed of everyone connected to such a server would have to be monstrous.