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The challenges where you have to get; 5 kills with one airstrike; 6 kills with one stealth bomber and 5 kills with one predator missile is bugged.
All you have to do is get that amount of kills using that killstreak how many times you want in one match.
Example : Triple predator kill + double predator kill = The Grim Reaper challenge.
PS: this is my first tutorial
PSS: I know this is off topic but what are those point to the left all about?
PSSS: Thanks for all the positive feedback guys, and the rep.