Tier 1
ExtremeConditioning –Sprint longer distances + Climb obstacles faster
Sleighthand – Reload faster + Faster weapon swapping
Scavanger – Reload ammo from bags + Spawn with more ammo
Blind Eye – Undetectable from air support + Faster launcher lock on and extra damage to air support
Recon – Explosive damage marks target on HUD + Bullet damage marks target on HUD
Tier 2
Hardline – One less kill for Killstreak + Two assists count as a kill towards next killstreak
Assassin – Immune to UAV, Motion Sensor, Thermal and Heartbeat Sensor + Immune to CUAV & EMP
Overkill – Two primary weapons + Second primary can have 2 attachments
Quickdraw – Faster aim down sights + Faster animation of using equipment and throwing grenade
Blastshield – Flack Jacket (Immune to most explosives) + Immune to stuns and flashes
Tier 3
Sitrep – Enemy equipment is visible + Enemy footsteps are more clear
Dead Silence – Your footsteps are silent + No fall damage
Stalker – Faster movement with ADS + Delay on claymores
Marksman – ID target from range + Longer hold breath on scoped weapons
Steady Aim – Increased hip fire accuracy + Faster aim down sight while sprinting
MW3 DeathStreaks
Juiced [Lightweight] – 4 Deaths
Martyrdom – 4 Deaths
Final Stand – 4 Deaths
Revenge (Last person that killed you is always visible on your mini map) – 5 Deaths
Stopping power for one kill – 5 Deaths
Dead Mans Hand (You run around with c4 in your hand (suicide bomber)) – 6 Deaths