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6 kills
Call in a directional airstrike
The Precision Airstrike is unlocked after getting 6 kills in a row or 5 with "Hardline" perk equipped. The Precision Airstike allows the player to call in three F-15 fighter jets on a bombing run at the location of your choice. You can highlight your target location with a small "target" for both position and direction of the bombing run. Bombs dropped by Precision Airstrikes are effective at taking out groups of players, especially near spawn points. It's also useful on Search and Destroy when clearing the bombsight just before planting the bomb. In general, it's most useful on objective based games because you can easily retain an objective by calling in your airstrike, which will kill any enemies trying to capture your objective.
Strategy
This killstreak isn't being used by many players any more due to it being over-shadowed by many of the new killstreaks, however it's still effective on large and small maps. It works well on large maps such as Wasteland too, because it will bomb a specific area. If you bomb the spawn of the enemy team then you can get easily kills. Rust or Scrapyard are both great examples of smaller maps on which the Precision Airstrike will rip the enemy a new one.
https://callofduty.wikia.com/wiki/Call_of_Duty_Wiki