Kill Streaks!

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Kill streak bonuses
Get the indicated number of consecutive kills in Multiplayer mode to get the corresponding bonus:

UAV: 3 (reveals enemies on mini-map)
Care Package: 4 (ammo or killstreak air drop that can be collected by anyone)
Counter UAV: 4 (disables enemy radar)
Predator: 5 (guided missile)
Sentry Gun: 5 (airdropped weapon)
Precision Airstrike: 6 (select a location to bomb)
Attack Helicopter: 7 (helicopter backup)
Harrier Strike: 7 (select a location to bomb and defend with a Harrier)
Emergency Airdrop: 8 (four ammo or killstreak air drops that can be collected by anyone)
Pave Low: 9 (armored helicopter backup)
Stealth Bomber: 9 (undetectable airstrike)
AC-130: 11 (operate a plane gun)
Chopper Gunner: 11 (operate a helicopter gun)
EMP: 15 (disables enemy electronics)
Tactical Nuke: 25 (kills everyone)