iPad wallpapers: Military writes: "Continuing our military theme, this wallpaper gallery gives you some of the largest ground-based machinery ever made: military tanks. Invented by the British during WWI, the tank is now an essential part of any army’s arsenal and plays a vital role in current theaters of war. The US have used tank divisions to startling effect in the Middle East, as they work hand in hand with infantry ground forces in coordination with air attacks. Here are a few of those mighty metal warriors."

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