Who is Sergeant Lightbody from The Wanting Seed and what is their importance?

Sergeant Lightbody has the lifetime soldier's cynicism toward the military and battle. He believes that the world is entering a period of constant, interminable warfare. He believes that the government wants soldiers to think they have a choice regarding going to war, although in reality they have no option. Lightbody does not believe he will survive and sees no way out of his predicament. He dies in battle.