Call of Duty Modern Warfare 2 Perks/Pro Perks List

--- Perk Slot 1 ---

Marathon - Unlimited run/sprint
Marathon Pro - Move over obstacles more quickly

Sleight of Hand - Reload faster
Sleight of Hand Pro - Reload faster, plus left trigger zoom/aim faster

Scavenger - Full ammo restock from dead enemies
Scavenger Pro - Extra ammo magazines

Bling - 2 Attachments for Primary Weapon
Bling Pro - 2 Secondary Attachments

One Man Army - Switch classes during gaming/round.
One Man Army Pro - Switch class more quickly.

--- Perk Slot 2 ---

Stopping Power - Improved bullet damage
Stopping Power Pro - Improved bullet damage against vehicles

Lightweight - Move faster
Lightweight Pro - Quick aim after sprinting

Hardline - Kill Streaks requirement fulfilled with 1 less kill
Hardline Pro - Death Streaks require fulfilled with 1 less death

Cold-Blooded - Undetectable on enemy radar, air and thermal
Cold-Blooded Pro - No name tag or reticle on you when sighted by enemy

Danger Close - Increased explosive damage
Danger Close Pro - Increased killstreak damage

--- Perk Slot 3 ---

Commando - Melee hit from farther away
Commando Pro - Reduced fall damage

Steady Aim - Increased accuracy when firing off the hip
Steady Aim Pro - Hold breath to steady aim with scope, like old Iron Lungs perk

Scrambler - Jams enemies' radar for a small radius
Scrambler Pro - Enemy claymores trip more slowly

Ninja - Invisible to heartbeat sensor
Ninja Pro - Silent footsteps, same as old Dead Silence perk

SitRep - See enemy explosives and tactical insertions, similar to Bomb Squad
SitRep Pro - Louder enemy footsteps

Last Stand - Same as COD 4, except you can crawl now
Last Stand Pro - Use equipment while in Last Stand