Double Subverted:...And then the Elite Mook springs back up and kills him.
Parodied: Everyone who introduces themselves to Sgt. Steel dies horribly seconds later.
Zig Zagged: Liam came back from the dead as a ghost as accompanies Steel. Only some characters can see him, though, but otherwise, he is nothing more than a Satellite Character or Living Prop without any character development.
Averted: Liam never died. Liam is an Invincible Hero and therefore can't die.
Enforced: The author wants to show how violent and unpredictable war or life in general is, and the random nature of death.
Lampshaded: At Liam's funeral, someone asks Sgt. Steel, "Wait, who was this guy again?"