Perks

Double Time: Double the duration of Tactical Sprint. Increase crouch movement speed by 30%.
Unlocked: Default

E.O.D.: Take reduced damage from non-killstreak explosives and fire.
Unlocked: Default

Scavenger: Resupply ammo from dead players.
Unlocked: Level 18

Cold-Blooded: Undetectable by AI targeting systems and thermal optics. Does not trigger High Alert warning.
Unlocked: Level 29

Kill Chain: Killstreak kills count towards your next killstreaks. Only applies to Killstreaks earned this life. Not effective when Specialist is active.
Unlocked: Level 34

Quick Fix: Killing players immediately starts health regeneration. Capturing and hold objectives increases your health regeneration rate.
Unlocked: Level 42

Restock: Recharge equipment over 25 seconds.
Unlocked: Default

Hardline: Your killstreaks cost 1 less kill
Unlocked: Default

Overkill: Carry two primary weapons
Unlocked: Level 8

High Alert: Your vision pulses when enemies outside of your view see you.
Unlocked: Level 11

Ghost: Undetectable by UAVs, Radar Drones, and Heartbeat Sensors.
Unlocked: Level 24

Pointman: Killstreaks are earned through game score instead of number of kills.
Unlocked: Level 49

Tune Up: Reduces the charge time of field upgrades by 40%
Unlocked: Default

Amped: Faster weapon swap and rocket launcher reload speed
Unlocked: Default

Shrapnel: Spawn with an extra piece of lethal equipment. Explosive damage delays enemy health regeneration.
Unlocked: Level 13

Battle Hardened: Reduce strength of enemy flash, stun, EMP, and gas effects. Immune to snapshot grenades.
Unlocked: Level 26

Spotter: See enemy equipment, field upgrades, and killstreaks through walls. Mark them for your team by aiming down sights. Hack enemy Claymores, Proximity Mines, C4, and Trophy Systems.
Unlocked: Level 38

Tracker: Enemies leave behind a footprint trail. See markers at enemy death locations and his the death markers of enemies you kill.
Unlocked: Level 51