Forerunner Didact wrote:
The Marathon symbol was incormorated into every single Halo game that Bungie had made. You could not go one level without it being SOMEWHERE in the game. In the Halo series, it is refered to as the symbol for the word "Reclaimer" representing all Human beings right to inherit all Forerunner technology, along with the Forerunners belief in the Mantle.
The symbol for the Mantle of Responsibility is a different symbol than the one for the Forerunner/Marathon. Just search for the Mantle's page right on this wiki and see for yourself. Different symbols, but related.