Juggernaut

Juggernaut is a perk that featured in Call of Duty 4 Modern Warfare and in World at War, also in CODMWXX and Urban Warfare. This perk decreases the bullet and explosive damage by 25% to the player, also players can throw back safely grenades threw by enemies. NOTE: Players can still die by headshots and knife attacks (but with less probability of death).

Juggernaut Pro
In the Pro Version, Juggernaut players can carry heavy weapons (such as LMGs) without losing their normal speed. To get Pro version you must:
 * Survive 10 explosions.
 * Throwback 20 enemy grenades.
 * Get 100 kills with Juggernaut.

Juggernaut Elite
In the Elite version, players' damage will be raised and explosive and fire damage will be decreased by 50%. To get Elite version, you must:
 * Survive 30 explosions.
 * Throwback 50 enemy grenades.
 * Get 200 kills with Juggernaut.

Juggernaut Contract Reward
You will get the Jugg Walk perk if completed. You must:
 * Get 200 kills with Juggernaut.
 * Plant/Defuse 15 bombs.
 * Throwback 10 grenades in a single match.

Curiosities

 * Juggernaut perk was made based on Flak Jacket features.