Hackers have accessed designs for more than two dozen major U.S. weapons systems, according to a devastating classified report a Pentagon advisor shared with the Washington Post.

Although the report from the Defense Science Board did not identify the hackers, senior military and industry officials with knowledge of the breaches say they come primarily from China, according to Ellen Nakashima of the Post.

"This is billions of dollars of combat advantage for China. They've just saved themselves 25 years of research and development. It's nuts," a senior official told the Post.

http://www.businessinsider.com/china-hac...-systems-2013-5