Perk 1 Category:
Marathon
Standard: Unlimited Sprint
Pro: + Climb obstacles faster
Sleight of Hand
Standard: Faster reload
Pro: + Aim down sights faster.
Scavenger
Standard: Full resupply from dead bodies
Pro: + Extra magazines
Bling
Standard: Dual attachments on primary weapon
Pro: + Dual attachments on secondary weapon
One Man Army
Standard: Swap classes at any time
Pro: + Swap classes faster
Perk 2 Category:
Stopping Power
Standard: Increased bullet damage
Pro: + Increased bullet damage to cars and Killstreak vehicles
Lightweight
Standard: Move faster
Pro:
Hardline
Standard: Killstreaks rewards require 1 less kill
Pro: + Deathstreaks require 1 less death
Cold Blooded
Standard: Undetectable by UAV, air support, sentries, and thermal
Pro: No red crosshair or name when targeted
Danger Close
Standard: Increases explosive weapons damage
Pro: Extra air support damage
Perk 3 Category:
Commando
Standard: Increased melee distance
Pro: + No falling damage
Steady Aim
Standard: Increased hip-fire accuracy
Pro: Hold your breath for longer when sniping
Scrambler
Standard: Scrambles the radar of nearby enemies
Pro: Delay enemy Claymore explosions
Ninja
Standard: Invisible to heartbeat sensors
Pro: + Move silently
SitRep
Standard: Insertions. Reveals enemy explosives and Tactical Insertions
Pro:
Last Stand
Standard: Survive (on the ground) for 10 seconds after being killed. You can use a pistol
Pro: + Use grenades and equipment aswell as your pistol