Lyric discussion by DarkSideMoon 

Cover art for Demon Seed lyrics by Nine Inch Nails

I agree that this album is a continuation of the year zero plotline. I think this and lights in the sky are related. The person's best friend, wife, mother, whatever, dies in Lights in the Sky, this person joins the army out of anger, desperation, whatever. I think this has to do with the drug that makes the soldiers ruthlessly violent. Demon seed as a nickname.