From the Modern Warfare 2 Wiki\n\n They affect available equipment, effectiveness of the player's equipment, the usefulness 🎉 of the enemy's equipment, and the physical properties of the player's character.

There are eight perk packages in total that you 🎉 can select and equip to your Loadout in Modern Warfare 2. Each perk package comes with two Basic Perks, one 🎉 Bonus Perk, and one Ultimate Perk. Some perks can be found in more than one perk package, but each perk 🎉 package as a unique combination of perks you can equip.