The Net: Tomorrow's Battleground?

The United States military is asserting its right to "fire back" as a defense not only in real-life, but also on the web. As a completely uninformed civilian, I'd say that sounds reasonable to me. But it makes me think: will tomorrow's world wars be fought in server-rooms and offices?

Many economic and diplomatic experts these days claim another world war is impossible due to the fully internationalized economy; we're all so integrated with each other that it simply wouldn't be possible. Perhaps they are correct when it comes to a physical war, but what if it was a world war fought only on cyber battlefields? (And no, I'm not talking about a first-person-shooter :P)

It is an interesting thing to think about. Would the civilians of this type of war not even know it was being waged? Or would they constantly have their bank accounts disappear, infrastructure destroyed, basic services shut down, etc?

I suppose tomorrow's soldiers might look quite a bit different from the ones we've known previously. Goodbye muscles, hello sickly looking kid with glasses? Haha :)