From the New York Times:
"'Ender's Game' has had a lot of influence on our thinking," said Michael Macedonia, director of the Army's simulation technology center in Orlando, Fla., which plans to build a virtual Afghanistan that could host hundreds of thousands of networked computers. "The intent is to build a simulation that allows people to play in that world for months or years, participate in different types of roles and see consequences of their decisions."The military has already licensed There's technology for testing in virtual worlds.