Perk 1

   -Marathon: Unlimited sprint.

   Pro: +Climb obstacles faster.

   -Sleight of Hand: Faster reloading.

   Pro: +Faster aiming.

   -Scavenger: Resupply from dead enemies

   Pro: +Extra magazines.

   -Bling: 2 primary weapon attachments.

   Pro: +2 secondary weapon attachments.

   -One Man Army: Swap classes at any time.

   Pro: Swap classes faster.

Perk 2

   -Stopping Power: Increased bullet damage.

   Pro: +Extra damage vs. enemy vehicles.

   -Lightweight: Move faster.

   Pro: +Quick aim after sprinting.

   -Hardline: Killstreaks require 1 less kill.

   Pro: +Deathstreaks require 1 less death.

   -Cold-Blooded: Undetectable by UAV, air support, sentries, and thermal.

   Pro: +Crosshairs do not turn red and name is not displayed when targeted.

   -Danger Close: Increased explosive weapon damage.

   Pro: +Extra damage against air support.

Perk 3

   -Commando: Increased melee distance.

   Pro: +No falling damage.

   -Steady Aim: Increased hip fire accuracy.

   Pro: +Hold breath longer (Sniping)

   -Scrambler: Jam enemy radar near you.

   Pro: +Make claymore explosions delayed.

   -Ninja: Invisible to heartbeat sensors.

   Pro: +Your footsteps are silent.

   -SitRep: Detect enemy explosives and tactical insertions.

   Pro: +Enemy footsteps are louder.

   -Last Stand: Pull out your pistol before dying.

   Pro: +Use equipment and special grenades when down.