FBI raids Bay homes in hunt for hackers CLOVERDALE - Federal agents descended on [snip..] The Department of Defense is hacked some 250,000 times each year, according to a Pentagon study that simulated computer crimes to test the vulnerability of military networks. In 1996, as many as 162,500 "break-ins" occurred - about 65 percent of the 250,000 total attempts to get in, according to the General Accounting Office.