Recon armor
Unlock the "Vidmaster Challenge: 7 on 7", "Vidmaster Challenge: Brainpan", "Vidmaster Challenge: Annual", and "Vidmaster Challenge: Lightswitch" achievements in Halo 3. Unlock the "Vidmaster Challenge: Classic", "Vidmaster Challenge: Deja Vu", and "Vidmaster Challenge: Endure" achievements in Halo 3: ODST. Then, go to Bungie.net to get a download code to unlock the Recon armor in Halo 3: ODST. Note: You will need a valid and linked Bungie.net account to get the download code.
Bonus Firefight missions
Successfully complete the indicated task to unlock the corresponding mission in Firefight mode:
Alpha Site: Successfully complete Mission 5: ONI Alpha Site on the Normal, Heroic, or Legendary difficulty. Chasm Ten: Successfully complete Mission 8: Date Hive on the Normal, Heroic, or Legendary difficulty. Last Exit: Successfully complete Mission 9: Coastal Highway on the Normal, Heroic, or Legendary difficulty. Lost Platoon: Successfully complete Mission 3: Uplift Reserve on the Normal, Heroic, or Legendary difficulty.
Bonus Firefight characters
Successfully complete the indicated task to unlock the corresponding character in Firefight mode:
Buck: Successfully complete Mission 2: Tayari Plaza on the Normal, Heroic, or Legendary difficulty. Dare: Successfully complete Campaign mode on the Legendary difficulty. Dutch: Successfully complete Mission 3: Uplift Reserve on the Normal, Heroic, or Legendary difficulty. Mickey: Successfully complete Mission 4: Kizingo Boulevard on the Normal, Heroic, or Legendary difficulty. Romeo: Successfully complete Mission 6: NMPD HQ on the Normal, Heroic, or Legendary difficulty. UNSC Sergeant Avery Johnson: Requires a unique pre-order code.