Kill streak bonuses: During online multi-player mode you can call in an air-strike if you get a five kill streak without dying and a helicopter after a seven kill streak. You can call in the airstrike or helicopter at any time in the match, even if you die, as long as you acquired the necessary number of kills without dying. However, there is problem if you get a five kill streak and get two more without dying that allows you to call in a chopper. If you get a seven kill streak and have not used your airstrike, you will not be able to use it. You will be able to use the chopper in the same way. Basically you can get the ability to call in a chopper or airstrike and use it whenever desired, even in the finalminute of the game. This trick also works to call in a UAV after a three kill streak.