Not sure what system if any, but from what I've seen of Aliens Phalanx it might be an interesting world to play in.  A world that had almost one million people reduced to just over thirty thousand, after 'demons' (xenomorphs) descended out of black smoke mountain and humanity is put on the defensive with 4 underground Cities being the last strongholds of the human race on the planet.  young men and women being sent out as runners to transfer supplies between the cities on the surface and hopefully make it back alive.  men having to complete 5 runs in fifteen years, and women having to complete ten runs in fifteen years unless they are pregnant.  more an interest check then anything, I don't want to run it but am curious if others do.