The US military has tracked the activities of a group of perhaps 20 hackers that have been gathering military secrets from the US Defense Department and other agencies. The attacks have been traced to Guangdong and Alan Paller, the director of the SANS Institute pointed to the “intense discipline” of the attackers as evidence of their military training, they “were in and out with no keystroke errors and left no fingerprints, and created a backdoor in less than 30 minutes. How can this be done by anyone other than a military organization?”
Paller commented that espionage is not uncommon among Governments, "Governments will pay anything for control of other governments' computers. All governments will pay anything. It's so much better than tapping a phone".
The UK Government has also cited attacks from the “Far East” as a cause for concern.
Of course, an elite force of highly disciplined military hackers might think of the possibility of counter-intelligence and decide to hide their origin. They might choose to take over a poorly-protected PC to use as a launching point for their attack, say in an area with high growth of broadband connectivity, where there will be many users getting an always-on connection for the first time. Beware of the Zombies: do you know which Government your PC is hacking today?