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If you have it on Xbox 360 or PS3 just play online and keep doing online matches till you get to level 4. You get points when you kill someone or send in air strike or helicopter. Air strike is 3 kill streak and I think helicopter is 5 kill streak. If you have been leveled up in the middle of a match online It will say You've been promoted! E.g: Yo've been promoted Gunnery sergernt 1.

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14y ago

What else can I help you with?