You need more detail in an RPG.
That said, you could use the injury rules from LOS if all you wanted was a more detailed squad game, and add the Junction Point Campaign experience rules, and voila! Alternatively you could add a rule for "heroes" or "characters" which would basically be that they don't die outright without meeting certain conditions. Maybe if they can't be evacuated in a rerun of the same scenario, using fresh troops for both sides, with their "kill" spot marked as the objective for the mission, THEN they die.
Alternatively just run an RPG in the massive implied universe from the LOS fluff. Use Savage Worlds or Fudge or for real fanatics, write up life-paths etc for Burning Wheel. Burning Empires might work, replacing the Worm with Machine invasion, utilising brain-chips for the Infiltration phase (Clearly either BloodLord or Charlie Overlords).