China, security experts believe, has long probed United States networks. According to a 2007 Defense Department annual report to Congress, China’s military has invested heavily in electronic countermeasures and defenses against attack, and concepts like “computer network attack, computer network defense and computer network exploitation.”
According to the report, the Chinese Army sees computer network operations “as critical to achieving ‘electromagnetic dominance’ ” — whatever that is — early in a conflict.
"When Computers Attack," New York Times, 24 June 2007
In re "whatever that is," see: