After being demoted to Private, (former Major) WIlliam Cage redeems himself on the "repeated battlefield" and saves humantiy from almost unstoppable alien invaders.
“Battle is the Great Redeemer. It is the fiery crucible in which true heroes are forged. The one place where all men truly share the same rank, regardless of what kind of parasitic scum they were going in.”- Master Sergeant Farell