Modern wars are often fought in urban settings, and modern troops deploy all sorts of high-tech weaponry.

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Cohen also said it's vital for the U.S. to maintain its edge in high-tech weaponry, to win quickly and decisively.

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The Predators have the most high-tech weaponry (including a personal cloak, shoulder cannon, and special medkit) but are constantly running out of power and must constantly replenish their energy.

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