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Some of you may know this but I just figured it out and no one I was playing with knew it either.
When you rack up 2 or more killstreaks you can choose which one you want by pressing up and down.
For example: You have a UAV/Advanced UAV but you dont use it and get a stealth bomber. You have no clue where to call the stealth bomber so just press down to scroll to the UAV, use the UAV, then you know where to call in the stealth bomber.
Just thought I'd share, this comes in handy if you might be boosting and you get a nuke but want to call in your killstreaks you earned before the nuke.
Good luck.