Some may disprove this glitch or whatever you call it, but it gives you no advantage really, except a couple 10K expirience boosts. Everyone is talking about how the care package glitch gets you a lot of cold blooded kills, but there is a 'glitch' that lets you get about 50 kills for every chopper you shoot down. When the enemy calls in a chopper, switch to a class with a huge weapon magazine, like an RPD, which has 100. Shoot down the heli with bullets, NOT rockets. Bullets make the heli spin out of control, rockets just blow it up. As the heli is spinning out of control, keep shooting it with the RPD, even though you already 'killed' it. Every single bullet that hits it when it is spinning out of control counts as a cold blooded kill. It does not add to your score, or kills, or killstreak rewards, but it counts as shooting down air support with every single bullet that hits the spinning helicopter. I got cold blooded pro VI from like 3 helicopters. 30k experience, and an emblem if you don't already have it.