Perks in Call of Duty: Modern Warfare 3 function in the exact same way as they do in previous Call of Duty titles. These perks boost your abilities as a soldier and allow you to customize your character in multiplayer. Players can equip up to three perks at a time.
Call of Duty: Modern Warfare 3 Perks Tier 1
Recon: Explosive damage paints the target on the mini-map.
Recon Pro: Bullet damage paints the target on the mini-map.
Sleight of Hand: Faster reloading.
Sleight of Hand Pro: Swap weapons faster.
Blind Eye: Undetectable by air support and sentries.
Blind Eye Pro: Launchers lock-on quicker. Extra bullet damage versus air support and sentries.
Extreme Conditioning: Sprint for longer distances.
Extreme Conditioning Pro: Climb obstacles faster.
Scavenger: Get ammo from dead enemies.
Scavenger Pro: Get even more ammo by picking up their bag.
Call of Duty: Modern Warfare 3 Perks Tier 2
Quick Draw: Faster aiming.
Quick Draw Pro: Recover from equipment and grenade usage quicker.
Blast Shield: Increased explosive resistance.
Blast Shield Pro: Resistance to flash and stun.
Hardline: Killstreaks require one fewer kill.
Hardline Pro: Two assists count as a kill towards killstreaks. Death streaks require one less death.
Assassin: Immunity to UAV, portable radar, thermal and heartbeat.
Assassin Pro: Immunity to CUAV and EMP. No red crosshair or name when targeted.
Overkill: Carry two primary weapons.
Overkill Pro: Secondary primary weapon can have two attachments.
Call of Duty: Modern Warfare 3 Perks Tier 3
Marksman: Identify enemy targets at longer range.
Marksman Pro: Longer hold breath.
Stalker: Move faster while aiming down the sight.
Stalker Pro: Delay enemy claymore explosions.
Sitrep: Detects enemy explosives and tactical insertions.
Sitrep Pro: Louder enemy footsteps.
Steady Aim: Increases aim while firing from hip.
Steady Aim Pro: Weapon is ready faster after sprinting.
Dead Silence: Quiter movements, recon does not work as well against you.
Dead Silence Pro: Take no fall damage.