When you complete the following tasks the corresponding perk will become available.
Danger Close Pro:
Using the Danger Close perk get 100 kills with explosives. Its effect is increased explosive weapon damage and extra air support damage.
Get 40 Killstreaks with the Hardline perk. Its effect is that Killstreak rewards require one less kill and Deathstreak rewards require one less death.
Destroy 120 detected explosives or tactical insertions with the Sitrep perk. Its effect is detect enemy explosives and tactical insertions and louder enemy footsteps.
Destroy 40 enemy Killstreak rewards with the Cold-Blooded perk. Its effect is is undetectable by UAV, air support, sentries, and thermal imaging; and no red crosshair or name when you are targeted.
Get 200 kills with a weapon with two attachments. Its effect is two primary weapon attachments and two secondary weapon attachments.
Using the Commando Perk get 20 melee kills. Its effect is increased melee distance and no falling damage.
Using the Ninja Perk get 50 close range kills. Its effect is invisible to heartbeat sensors and silent footsteps.
Resupply 100 times with the Scavenger perk. Its effect is resupply from dead enemies and extra magazines.
Using the Scrambler perk get 50 close range kills. Its effect is jam enemy radar near you and delay enemy claymore explosions.
Steady Aim Pro:
Using the Steady Aim perk get 80 hip fire kills. Its effect is increased hip fire accuracy and longer hold breath duration.
Stopping Power Pro:
Get 300 Kills with the Stopping Power perk. Its effect is extra bullet damage and extra damage to enemy vehicles.
Run 30 Miles with the Lightweight perk. Its effect is move faster and quick aim after sprinting.
Run 26 Miles with the Marathon perk. Its effect is unlimited sprint and climb obstacles faster.
Sleight of Hand Pro:
Get 120 kills with the Sleight Of Hand perk. Its effect is faster reloading and aiming.
Added by: Sanzano Nov 18th 2009, ID#5144