Here is the full Call of Duty: Black Ops killstreak rewards list.

3 Kills – Spy Plane: Shows enemies on the mini-map. Can be shot down
3 Kills – RC-XD Explosive RC Car: Remote controlled car strapped with explosives
4 Kills – Counter Spy Plane: Temporarily disables enemies mini-map
4 Kills – SAM Turret: Airdrop a placeable SAM turret that destroys aircraft
5 Kills – Care Package: Airdrop a random killstreak or ammo crate
5 Kills – Napalm Strike: Airstrike that covers an area in napalm
6 Kills – Sentry Gun: Airdrop a placeable Sentry Gun
6 Kills – Mortar Team: Target 2 locations to bombard with Mortar Strikes
7 Kills – Attack Helicopter: Call in a support helicopter
7 Kills – Valkyrie Rockets: Launcher with remote controlled rockets
8 Kills – Blackbird: Shows enemy position and direction on the mini-map. Cannot be shot down
8 Kills – Rolling Thunder: Carpet bombing airstrike
9 Kills – Chopper Gunner: Be the gunner of an attack helicopter
11 Kills – Attack Dogs: Attack dogs that hunt the enemy down
11 Kills – Gunship: Pilot an attack helicopter