Modern Warfare 2 Perks

[Left2body]

Marathon (Tier 1)
Standard: Unlimited Sprint
Pro: Get over obstacles faster

Sleight of Hand (Tier 1)
Standard: Faster reload
Pro: Aim down sights faster

Scavenger (Tier 1)
Standard: Retrieve ammo from dead bodies

Bling (Tier 1)
Standard: Dual attachments on primary weapon
Pro: Dual attachments on secondary weapon

One Man Army (Tier 1)
Standard: Use primary weapon in secondary slot

Stopping Power (Tier 2)
Standard: Increased bullet damage
Pro: Increased bullet damage to vehicles

Lightweight (Tier 2)
Standard: Move faster

Hardline (Tier 2)
Standard: Killstreaks rewards require 1 less kill
Pro: Deathstreaks require 1 less death

Cold Blooded (Tier 2)
Standard: Undetectable by UAV, air support, sentries, and thermal

Danger Close (Tier 2)
Standard: Increases explosive weapons damage

Commando (Tier 3)
Standard: Increased melee distance

Increased melee speed Steady Aim (Tier 3)
Standard: Increased hip-fire accuracy

Scrambler (Tier 3)
Standard: Jams enemy radar

Ninja (Tier 3)
Standard: Invisible to heartbeat sensors
Pro: Move silently

SitRep (Tier 3)
Standard: Insertions. Reveals enemy explosives and Tactical Insertions

Last Stand (Tier 3)
Standard: Survive after being killed for 10 second, pistol equipt. You can crawl too

http://kotaku.com/5394755/and-here-a...tiplayer-perks