Unlock the following bonuses by getting the corresponding amount of consecutive kills without dying:
BONUS - KILLSTREAK/DESCRIPTION Spy Plane - 3 kills; shows enemies on the mini-map (free). RC-XD - 3 kills; remote control car with explosives piloted by killstreak user (1,200 points). Counter-Spy Plane - 4 kills; temporarily disables enemy's mini-map (1,600 points). SAM Turret - 4 kills; airdrop a turret that destroys aircraft (1,600 points). Care Package - 5 kills; airdrop a crate that contains a random killstreak, ammo crate, or special weapon (free). Napalm Strike - 5 kills; airstrike drops fire over an area of the your choice which burns and damages enemies temporarily (2,400 points). Sentry Gun - 6 kills; airdrops anti-personnel sentry gun (3,200 points). Mortar Team - 6 kills; user targets three locations to be shelled by mortars (3,200 points). Attack Helicopter - 7 kills; call in automated attack helicopter to a selected location (free). Valkyrie Rockets - 7 kills; two remote controlled rockets (4,000 points). Blackbird - 8 kills; advanced version of the spy plane that indicates enemies on the map and direction they are facing (4,500 points). Rolling Thunder - 8 kills; B-52 bomber bombs selected location (4,500 points). Chopper Gunner - 9 kills; control door-mounted mini-gun from a helicopter that circles the map; enemies without the Ghost perk are displayed as red dots (5,000 points). Attack Dogs - 11 kills; call in a group of attack dogs (6,000 points). Gunship - 11 kills; pilot a helicopter with rockets and machine guns; helicopter can be destroyed (6,000 points).