I think that in the barracks instead of keeping track of how many of a certain killstreak you call in, it should keep track of how many you earn. I am currently level 42 and I have earned 8 AC-130's trying to get its title, but it says I have only gotten 6 because for one an EMP was called in at 20 seconds left as I was about to call it in, and the other was earned as I got the final kill. I think everyone one would benefiet from this.
I think it done that way so people have to actually use them. Other wise you could just boost them easier.
I could run hardline and uav and have about 10+ a match sometimes if that was the only one selected. If I did not call them in, it would make it every easy to get any challenges for the UAV done.