Cheats for Halo 3: ODST

"Buck" Firefight Character	Complete "Tayari Plaza" on Normal or higher.
"Dare" Firefight Character	Complete the Campaign on Legendary difficulty.
"Dutch" Firefight Character	Complete "Uplift Reserve" on Normal or higher.
"Mickey" Firefight Character	Complete "Kizingo Boulevard" on Normal or higher.
"Romeo" Character	Complete "NMPD HQ" on Normal or higher.

Alpha Site	Complete the ONI Alpha Site campaign mission on any difficulty.
Chasm Ten	Complete the Date Hive campaign mission on any difficulty.
Last Exit	Complete the Coastal Highway campaign mission on any difficulty.
Lost Platoon	Complete the Uplift Reserve campaign mission on any difficulty.