In this cheat you get a 7 killstreak or higher. You get a care package then you find a gun on the ground.

When it says X to pick up, at the same time you press right on the D-pad. When it shows the gun that was on the ground you throw your care package then you throw stun grenades (you can only use them).

Then after you chuck the stuns you have to kill someone quickly before it hits the ground.

Then you'll get a 7 killstreak or higher (you can even get a nuke in the carepackage).