Confirmed as of November 7th, 2011
*new* M . O . A . B. - Mother of all Bombs is a 25 kill killstreak . Similar to nuke but not as powerful. You can only get it with gun kills. (not combined with killstreak kills , choppers, etc )
Assault Strike Killstreaks
3 UAV:Shows enemies on the minimap.
4 Care Package: Airdrop a random point streak or ammo.
5 (IMS)Intelligent Munitions System: Detects and eliminates enemy combatants.
5 Predator Missile: Remote control Missile.
5 Sentry Gun: Airdrop a placeable Sentry Gun.
6 Precision Airstrike: Call in a directional airstrike.
7 Attack Helicopter: Call in an Attack Helicopter.
9 Strafe Run: Strafing Run of 5 Attack Helicopters on a designated point.
9 Little Bird Guard: Get personal air support from a Little Bird Guardian.
9 Reaper: Laser missile targets remotely from the Reaper UAV
10 Assault Drone: Airdrop an Assault Drone.
12 AC130: Be the gunner of an AC130.
12 Pave Low: Heavily armored assault helicopter.
15 Juggernaut: Receive advanced armor via carepackage. M60E4 and MP412 revolver
17 Osprey Gunner: Be the gunner of a V-22 Osprey
Support Strike Killstreaks
4 UAV Shows enemies on the minimap.
5 Counter UAV Obscure enemy maps for 30 seconds.
5 Ballistic Vests Deploy a bag of Ballistic Vests for your team.
5 Airdrop Trap Kill enemies with a booby-trapped airdrop crate.
8 SAM Turret Automated SAM turret that destroys aerial killstreaks.
10 Recon Drone Control a Recon Drone, targeting enemies for your team.
12 Advanced UAV Call in an Orbital Recon that shows the position and direction of enemies.
12 Remote Turret Deploy a small turret and remotely control it.
14 Stealth Bomber Call in an Airstrike undetectable on enemy maps.
18 EMP Temporarily disable enemy electronics.
18 Juggernaut Recon Receive advanced armor via Airdrop.
18 Escort Airdrop Have a V-22 Osprey airdrop and protect 4 Care Packages.
2 - One Extra Perk
4 - Another Perk
6- Another Perk
8 - All perks
4 - Juiced - Recieve a seven second speed boost.
4 - Martyrdom - Drop a frag grenade upon death.
5 - Revenge - See the position of the last enemy that killed you on the radar.
5 - Hollow Points - Gives you extra bullet damage until you get a kill.
6 - Dead Man's Hand - Run around with a C4 in your hand so you can be like a suicide bomber.
6 - Final Stand - Survive after taking lethal damage. Your movement is slow as you get placed in a prone-like position. If you survive for long enough, you can get back up with full health.