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I bet that most of you know this but there are some who don't. So, when you get the precision airstrike, you can actually choose the direction of the airstrike. The big circle which you use to set the area of the strike has an arrow on one side of it, it indicates the direction of the airstrike, you can change the direction using the right stick

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Also, most of the cod 4 players will remember the mission 'death from above' and that you have a selection of 3 different turrets in your ac130, its the same in mw2, you can change the turret using the triangle on the PS3.
Thank if you didn't know this.