Killstreaks

• 3 kills= RC-XD Description: This killstreak allows you to remote control a small miniature car with explosives. The explosion is big enough to take out a few bad guys that are grouped together. 
  The RC-XD moves really fast and can go up stairs. It can be destroyed by the enemy.

• 3 kills= Spy Plane Description: This deploys a Spy Plane that shows enemies on the radar. The map is refreshed every 3-4 seconds. The Spy Plane flies around the map and can be shot down even with your primary weapon.

• 4 kills= Counter-spy Plane Description: Disables the enemy radar for a short period of time, even if they don't have a Spy Plane in the air.

• 4 kills= SAM Turret Description: Airdrops a placeable SAM turret that engages enemy aircraft. With this you don't need to carry a rocket launcher around.

• 5 kills= Care Package Description: This works just like in Modern Warfare 2, but this time a slow moving Chinook brings in the package. It's possible to shoot it down more easily due to its low altitude and speed. The Care Package itself contains a random killstreak or ammo.
  
  There are two exclusive weapons that can only be found inside a Care Package: "Grim Reaper" Rocket Launcher and "Death Machine" Minigun. Care Packages can be seen on the radar by everyone: if it's red, it belongs to the enemy team.

• 6 kills= Sentry Gun Description: Airdrop a placeable Sentry Gun that attacks enemy players. It can be temporarily disabled with concussion grenades.
  
  Sentry Guns are most effective when placed in high places.

• 6 kills= Mortar Team Description: Allows you to target 3 locations on the map that will be bombarded with Mortar Strikes.

• 7 kills= Attack Helicopter Description: Deploys the classic Cobra Attack Helicopter to engage enemies, just like in the previous Call of Duty games. You can select the area where the helicopter is deployed.

• 7 kills= Valkyrie Rockets Description: The Valkyrie Rockets are brought into the map in a Care Package that you have to pick up. You get 2 rockets. Valkyrie Rockets are controlled in 1st person (see the 2nd picture below) and can be controlled in all directions, but they have limited fuel that's indicated by a green bar.
  
  You can boost a rocket to give it extra speed and also detonate it whenever you want. They are also hard to control, but the rocket has a moderate explosion radius, so you don't need a direct hit to kill an enemy.

• 8 kills= BlackBird Description: Deploys a SR-71 Blackbird to monitor the map. You can see both enemy position and direction on the radar. The Blackbird doesn't have a refresh rate like the Spy Plane, so you can see the enemies in real-time until the Blackbird leaves the map.

• 8 kills= Rolling Thunder Description: Calls in a plane to carpet bomb the selected area. This is pretty much the Stealth Bomber killstreak reward from Modern Warfare 2.

• 9 kills= Chopper Gunner Description: Be the gunner of an attack helicopter. You can attack enemies with a minigun from the side of the helicopter that enters the map.

• 11 kills= Attack Dogs Description: This killstreak will spawn dogs to hunt enemy players on the map. Dogs can kill a player with one bite, so they should be killed as quickly as possible.

• 11 kills= Gunship Description: The gunship (helicopter) is fully controllable by the player. You can use both the minigun and rockets to kill enemies.