"We operate in five domains: air, land, sea, outer space and cyberspace," says Dan Kuehl, a professor of information operations at the National Defence University in Washington.

“我们在五大领域作战：水、陆、空、外太空和网络空间。” 华盛顿国防大学的信息作战教授丹屈尔说，“我们的工作越来越依靠网络空间；

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Who was Linda Kuehl?

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