User blog comment:AdvancedRookie/Some random Killstreaks/@comment-1701738-20100211001617

Air Superiority (8 Kills) - Calls in a fighter jet squadron to shoot down any and all air units currently on the map.

Reinforcements (10 Kills) - A small group of NPC units will spawn somewhere in the map and attack nearby enemy units. (They have the same "skill" and health as a Hardened difficulty NPC.)

Smoke Shield (5 Kills) - Mortar lobbed smoke canisters are shot into a flare-designated area.