Restricted Airspace

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On the mission Bio Lab at the end you will be driving a tank. When driving through the woods some helicopters will attack you along the way. You need to switch to EMP ammo and shoot them out of the sky. Small helicopters take one shot and larger ones take two. There are exactly 10 helicopters, so you may not miss one. If you let a helicopter escape you must restart the checkpoint. Once you have EMP shot all 10 of the helicopters you will unlock the trophy/achievement.

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