You can unlock the following rewards by meeting the Killstreak requirements below:

• 3 - UAV (Reveals enemies on minimap)
• 4 - Care Package (ammo / killstreak air drop -- can be collected by anyone)
• 4 - Counter UAV (disable enemy maps)
• 5 - Sentry Gun (airdropped)
• 5 - Predator (directed missile)
• 6 - Precision Airstrike (choose a location to bomb)
• 7 - Harrier Strike (choose a location to bomb and defend with a Harrier)
• 7 - Attack Helicopter (helicopter backup)
• 8 - Emergency Airdrop (four ammo / killstreak air drops -- can be collected by anyone)
• 9 - Pave Low (armored helicopter backup)
• 11 - Chopper Gunner (operate a helicopter gun)
• 11 - AC130 (operate a plane gun)
• 15 - EMP (disable enemy electronics)
• 25 - Nuclear Strike (kills all members of both teams)