This story in today's Washington Post details how China hacked into both the Obama and McCain campaigns during the summer of 2008 to gather sensitive data.
If one is of the mindset to view the 21st century as an impending conflict between China and the USA (and I'm not) this news would be pretty frightening. But it also would make you question military strategy. The US spends billions of dollars annually, even in peacetime, on things that blow up other things. This sort of technology has its limits, as we've painfully seen over the last decade. Emphasizing intelligence is not only cheaper, but it is more, well, intelligent.