Ah awesome, questions I've got all the answers. The Academy is your basic military academy where most if not all soldiers of the regime will be trained and taught. It's not necessarily mandatory to be there but if you want to join the ranks of the military you join. After your first year there you will be assessed and the top one hundred are brought into the Legion program, where they are further trained because they can actually deal with the higher amounts of stress and strain put onto the human body (if you've paled Mass Effect think N7 program). You join the schooling part of the Academy at a young age and the military part at the age of 16.

The utopia is a big brother is watching military run one, no crime in the upper cities where the wealthy live, food for the more important (namely in the upper cities), and they would say that there is no class separation but it's a farce as well, the people of the upper city stay there, and they look down upon the rest.

other jobs are government funded hackers, spies and the like (you could put them under military) there are mercenaries that aid both sides, although none would say they work for the resistance obviously less they want to be killed, most are normal jobs such as shop owners, standard businessmen. There are also information brokers, they tend to play both sides, but due to their importance in the world they are given not free reign to do so but most officials will not kill/arrest them unless the dealings are busted in on, and vice versa. Not to say there aren't any big time crimelords, as crime can run rampant anywhere, it's just they are in constant flux as the resistance has taken up residence in their turf and have not been able to get it back at all in the past twenty years. The resistance is full of mostly civilians trained by the few academy trained elite to survive after being listed as AWOL, their major base is in an older area of the vast city planet that has not been used for well over two centuries, there they found an underground bunker and hangar, it's also where they found the frigate, extremely loyal members of the rebels have stayed within the higher court of the regime, a type of senate that ultimately does nothing but mediate back to the Lord Marshal ( a band of forty puppets basically) the cityscape planet is split into districts with the only real named district being where everything starts, at the main academy inside the Albracht district, the rest are labeled 1-20. The overall population ranges in the trillions, hence why the cities are built upon each other, there is wildlife in the very depths of the world, but it's all become ferocious, sightless and just nasty due to the cities blocking out the sun from the lowest parts of the world.

The only ships that are being made at this point are mining ships, similar to Dead Space's world crackers only they crack gigantic asteroids and moons (well just like DS' world crackers then I guess) The only ship that has any decent weaponry is the Lord Marshal's own dreadnought which was built shortly after the war, others no doubt exist like in the one base the resistance has only it's more frigate sized. Now you may think well that should be enough to punch a hole in these so called barriers as they would no doubt have something akin to mass driver weaponry, same as the dreadnought but they pack no where near as powerful a punch. 

alright here's what I have about the resistance

The Resistance: Okay first their symbol is the very opposite of the regime, it is of an open hand that is painted pure white, a symbol of freedom and purity (the open hand meaning that all are free, and the white purity, I know not very original but this is where I was still playing with ideas, the others sucked) They are a force that is fighting for the freedom that so many people crave but have never voiced against the regime. They are not equal in strength to the regime but in the lower and undercities they know every nook and cranny and use that to their advantage to wage an urban guerrilla war against the military. They dare not use their ship until they can break the barrier protecting the capital district, the generator is inside the "keep" if you will guarded by a small force of Faceless, and a large division of inquisitor and stormtrooper soldiers. The resistance has trained their forces to at least match the standard units of the regime, but if the generals or the faceless get involved they flee, only the few leaders the resistance has can defeat them and they are rarely seen outside of their safe bunker out in the urban wilderness far enough away from the capital, or in their field HQ that has so far eluded the regime due to thugs and resistance members alike. The criminals may not like the fact the Resistance took up residence in their territory but what they want would lead to one hell of a payday for the criminals if it succeeds. 

You know here I thought I had everything pretty much thought out, I never realized how much another pair of eyes is needed when you try something this grand in scope. I've normally only handled smaller rps in fantasy settings, or even small scale Mass Effect rps (a sci fi game)