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This month, as they have every summer for 31 years, hundreds of thousands of North Korean soldiers will pour over the border and advance on the South Korean capital of Seoul, while U.S. and South Korean troops scramble to repel them.

The invading troops, fortunately, are not real. They're the imaginary opponents in one of the world's largest war games, which the United States and the Republic of Korea hold annually. But even as the allies mobilize thousands of real soldiers for the exercise, thousands more, along with all the aircraft, will be strictly virtual.

That's the case in a growing number of defense exercises. With ever-more-sophisticated simulation and modeling technology, the military today can mix and match real tanks, planes and ships with forces that exist only on computers -- and those located in virtual training environments, such as pilots in flight simulators thousands of miles away.
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Read More / Source: Wired News