WASHINGTON (CNN) -- Thousands of confidential files on the U.S. military's most technologically advanced fighter aircraft have been compromised by unknown computer hackers over the past two years, according to senior defense officials.
http://www.cnn.com/2009/US/04/21/pentagon.hacked/index.html
Yes I heard about this, seems they were most likely stationed out of China. However, they didn't get anything that was considered sensitive or classified, that's all kept in the Pentagon which is pretty much impossible to hack seeing as how their networks are not attached to the internet.