Originally posted by BOLT
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Shows enemies on the minimap
3 kills
This killstreak takes up you 3 killstreaks spot, however if using the Hardline perk it will only take 2 kills to achieve. It will show all enemies that aren't using "cold-blooded" perk as red dots on your radar located in the top left hand corner of your screen. The UAV will update the enemies position every 3 seconds and will last for 30 seconds. The player will receive 100XP for calling it in, but unlike Call of Duty 4 the UAV is physically flying in the air as a drone and can be shot down, which will reward the person shooting it down with 50XP. The UAV is most effective in team based game-modes as it's useful to find camping enemies trying to gain a large killstreak. If two team members call in a UAV it will refresh in a faster pace (1.5 seconds instead of 3), but that it is advised to wait and use your UAV once the other one flies away. That way you'll have 60 seconds of UAV, opposed to 30 second.
If both teams have a UAV/Counter UAV it doesn't matter which one you shoot at, as it will always be the opposing teams that will finish or be destroyed.
Strategy
The UAV is most helpful on Search and Destroy as this game-type is all down to stealth and moving slowly and checking your corners, a UAV which shows the enemy position is great in these kind of situations. It's also more useful on larger maps such as: Derail, Wasteland and Afghan this make sure when planting the bomb you will be safe unless the players are using "Cold-Blooded". The UAV is not only useful for yourself, but also your teammates. Especially if they're using higher killstreaks such as a Stealth Bomber or Harrier Strike as it reveals the enemies position and makes these killstreaks that more effective.