Cold-Blooded - Call of Duty: Modern Warfare 2 wiki

Cold-Blooded is a Tier 2 perk that appears in Call of Duty: Modern Warfare 2. When used, enemy vehicles will not detect the player. It's commonly used in Anti-Aircraft classes along with Stinger missles.

Challenges

• Cold-Blooded Pro I: Destroy 5 killstreaks using the perk.
• Cold-Blooded Pro II: Destroy 10 killstreaks using the perk. 
• Cold-Blooded Pro III: Destroy 20 killstreaks using the perk. 
• Cold-Blooded Pro IV: Destroy 40 killstreaks using the perk. 
• Cold-Blooded Pro V: Destroy 100 killstreaks using the perk. 
• Cold-Blooded Pro VI: Destroy 250 killstreaks using the perk.

Pro Version

The Pro version of Cold-Blooded takes away the enemies to see the red name above the player as well as the red of the cross-hairs when pointed at the player. If the player lies prone, it'll appear as if he's a corpse.

Tips

• By constantly tapping Y,  the player will look like a dead corpse.
• Looking like a dead corpse is particularly useful for capturing Objectives, because the enemy will only be seeing what looks like a dead corpse. However, it doesn't protect from random grenades thrown onto Objectives.