Killstreaks are based on how much kill you can get consecutively and for each level with an amount of consecutive kills, you will gain one reward. This amount of consecutive kills varies from 5 to >30. For exemple, with 5 kills you will get a CQB blaster; for 35 kills you will become a Jedi. Some of the reward is based on modern Call of Duty games (Juggernauts).
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