But these training simulations have a much longer history. And now - more than two years after U.S. troops pulled out of Afghanistan and nearly 21 years since the invasion of Iraq - they're being revamped yet again for another era of warfare.
For much of the long history of warfare, these types of urban simulations were unnecessary. Mostly because for much of history, warfare wasn't 'urban' at all - it happened on a battlefield.
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