And yeah, the gaming ADD bug has bit me hard. New! Shiny!
But can you blame me? Fantasy Flight put out a beautiful book, in a universe that eminently gameable - 40k. Yes, it is grimdark and bleak, but if you are okay with that, it just works. As a GM, I don't have to figure out why the other "heroes"/"supervisors"/etc. aren't here doing this task, there's just the PCs so if they want it done, they will need to do it themselves! Or get shot by the Commissioner trying and showing insufficient valor and fortitude.
I'd run as one part grim and dirty combat, of going house to house, with the panic of not knowing what was inside the doorway. One part will be the preposterous of orders and commands, contradictory and impossible, that fills the stereotypical soldier's life. Then finally, the comedic silliness that is part and parcel of the gaming table, as translated into the actions of bored soldiers who are on permanent deployment and will never be going home.
I'd want to run it as a series of Campaigns, from start to finish, as a war/conflict moves forth on various planets. Very much in line with Gaunt's Ghosts. I'd need to come up with some sort of tracking system so as the arcs progress, the players can watch as how the fight moves forwards and backwards.