This may sound like a cheap copy, but Halo: Reach ODST you play as Buck during the events of Halo: Reach it would include an enhanced firefight mode -you would spent points from killing enemies as upgrades nessecary to surviving to the next round -upgrades would be: weapon, vehicle, and troop drops -you would buy them through a radio somewhere on the map between waves -weapon drop-a Longsword drops 6 random weapon canisters on the map, with at least one power weapon vehicle drop-a pelican drops a UNSC vehicle of your choice troop drop- a pelican drops of a sqaud of marines, ODSTs, or spartans multiplayer would also be upgraded Invasion would pit ODSTs against elites and brutes if the covenant gain an objective, a dropship would drop AI controlled reinforcements to help the covenant players invasion would be played on urban, cramped battlefields in the armory, your ODST would be fully customizable using points not spent on upgrades in firefight