See
http://happyhacker.org/cyberwar/ for how to become a cyberwarrior, and some history of cyberwar.
Long, loooong ago, only a few hackers and computer criminals were breaking into computers. But today, computer breakins are the weapon of choice for giant crime syndicates and nations bent on spying and worse. So if you are serious about learning how to break into computers and fight others who break into computers, this will show you how to get a career that pays well, does good for your country, and is a whole heck of a lot safer than working for organized crime or terrorists.