There is speculation that a well-organized series of cyberattacks on sensitive U.S. government and government contractor sites may be organized by the Chinese army.
This article talks about the growing security problem but offers little firm evidence that the Chinese military is behind it. But given that China is a military dictatorship with rigid control over the country's Internet, it could be plausible.
Regardless of who is behind the attacks, it is a reminder that network security is just part of the job of managing company and community networks.