Full List:
3 Kill Streak: Uav - Enemies show as a red dot on the radar for 30 seconds.
4 Kill Streak: Care Package - Random package is dropped onto the map which can be collected by anyone on your team or on the other team it will of either ammo or a killstreak increase.
4 Kill Streak: Counter Uav
5 Kill Streak: Sentry Gun
5 Kill Streak: Predator Missile
6 Kill Streak: Precision Airstrike
7 Kill Streak: Harrier Strike
7 Kill Streak: Attack Helicopter - A helicopter comes for 60 seconds and shoots enemies.
8 Kill Streak: Emergency Airdrop
9 Kill Streak: Pave low
9 Kill Streak: Stealth Bomber
11 Kill Streak: Chopper Gunner - A more armoured helicopter comes for 60 seconds and shoots enemies.
11 Kill Streak: AC130
15 Kill Streak: Emp
25 Kill Streak: Tactical Nuke - A nuke demolishes everyone and your team auto wins
http://img21.imageshack.us/i/killstreaks.jpg/