Well, being a strong believer of the Halo religion, I think we need a good statue, to spark others who believe in them, to become more active, and maybe even start a place where we can pray that the Prometheans will be defeated swiftly, and without mercy.
What could be a better place than the White House lawn? The government could even give him a rocket launcher and have him be an anti-aircraft gun, or shoot missles to stop incoming missles, that could possibly pose a threat to the U.S.A. That may well be the most amazing statue ever build, and placed in such an amazing place. Master Chief bless America.