Call of Duty: MW3 Zombies features tiered missions for rewards as players progress through the storyline.
A Tier 1 mission in Act 1 requires players to execute zombies and repair a tire for rewards.
Aim at a running vehicle's tire, pop it, and repair it to complete the mission.
Find a drivable vehicle in the game.
Shoot the tire to make it flat for repair.
Position your character near the flat tire.
Interact to repair the tire when prompted.
Once repaired, use the vehicle to eliminate 30 zombies, taking note of any vehicle damage.
Step-by-step instructions simplify the tire repair process in MW3 Zombies.
Be careful when choosing drivable vehicles, as hitting zombies will cause vehicle damage.