A mod for Halo 3: ODST that drastically improves the AI in the game, both friendly and enemy. It also changes and rebalances the sandbox and other elements. All among other things. Covers the entire Halo 3: ODST campaign and Firefight experiences.
You even get a friendly Engineer on Chasm 10! Overshields and all.
Oh-ho-ho FINALLY...! I kept on getting VERY tired of the enemy getting overshield-capability which lent an unfair stance towards the opposing ODSTs. Once again you've improved a LOT upon Firefight, thanks once again. ^^