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Killstreaks you can use to get higher killstreaks: RC-XD, Mortar Team, Valkyrie Rockets, Chopper Gunner, Gunship
What you do: Blow up cars and barrels with your killstreaks instead of hitting the enemy directly with your killstreak.
Why this works: When you blow up a car or barrel it will register as kill from that and not from the killstreak. Due to this, it will count towards obtaining higher killstreaks.
Note: So it may be useful to call in your care package in the same life that you receive it because you may be able to use it to obtain a higher killstreak.