Strike Force Omega
It is the far future. Humanity spreads across the galaxy. Led by a council of corporate interests, the Imperial Core reaps the benefits of plunder and exploitation on an unimaginable scale, teeming trillions of human beings kept docile by mass media and the never-ending war against every other sentient species humanity has encountered.
You were a soldier in that war. Not one of the grunts, given basic training and a gun and shoved towards the enemy, although you might have started there. No, you were part of Strike Force Omega. Omega, because you ended things. Given the best training and equipment, remade by your corporate masters into a terrifying god of war, and expected to achieve the impossible on a regular basis. Which you did. Until you got out.