you just read the name of the guy who dies at the end of halo 3
The Master Chief returns to Instalation 005 (Another Halo) To activate the rings systems to wipe out the Flood and Covenant on Earth. All of Earths population (Including the Elites who are now on the Humans side) go into the Ark. The one place that the Halo rings will not effect. It's called a "Dysons Sphere" or something.
Anyway, Chief activates the rings. All life outside of the Ark (Including the Chief) die. Earth grows to it's former glory prior the war. And the Chief is given a heros funeral.