2. Find an object you can climb over. It has to have the pop up message saying 'Push A (x on PS3) to climb over'.
3. Push A (X on PS3) to climb over it, while your character is climbing, push right on the d pad once, then twice, during the climb over action. Afterwards, you should still have you care package out, rather than your gun. Repeat until you are certain you completed it before the jump over action is finished.
4. Call in your care package. Throw the smoke signal to the desired area, and when it arrives, collect it.
5. Call in what the package contained. If it contained a turret, place the turret, if it was a AC-130, call in an AC-130 and use it.
6. Now, if you did it right, you should have another care package. Repeat the steps above for each care package before using it, and you will have unlimited.