Tier 1
Sleight of Hand: Faster Reloading
Sleight of Hand Pro: Switch weapons faster
Recon: Explosive damage paints the target on the mini-map.
Recon Pro: Bullet damage paints the target on the mini-map.
Blind Eye: Undetectable air support and sentries.
Blind Eye Pro: Launchers lock-on quicker. Extra bullet damage versus air support and sentries.
Extreme Conditioning: Longer Sprint.
Extreme Conditioning Pro: Climb obstacles faster.
Scavenger: Resupply from dead enemies.
Scavenger Pro: Extra mags.

Tier 2
Quickdraw: Faster aiming.
Quickdraw Pro: Recover from equipment and grenade usage quicker.
Blast Shield: Increased explosive resistance
Blast Shield Pro: Resistance to flash and stun
Hardline: Killstreaks requires 1 less kill
Hardline Pro: Every two assists counts as a kill towards your killstreak. Deathstreaks require 1 less death.
Assasin: Immune to UAV, portable radar, thermal and heartbeat sensors.
Assassin Pro: Immune to CUAV and EMP. No red crosshair or name when targeted.
Overkill: Carry two primary weapons.
Overkill Pro: Second primary can be equipped with 2 attachments.


Tier 3
Marksman: Identify enemy targets at longer range.
Marksman Pro: Longer hold breath.
Stalker: Move faster while aiming.
Stalker Pro: Delay enemy Claymore explosives.
SitRep: Detect enemy explosives and tactical insertion.
SitRep Pro: Louder enemy footsteps.
Steady Aim: Increased hip-fire accuracy.
Steady Aim Pro: Weapon is ready after sprinting.
Dead Silence: Move quietly. Reduce the effects of Recon.
Dead Silence Pro: No fall damage.