Today details were revealed concerning weapon designs and technologies compromised by hackers. It appears the hackers were from China.
A list of the weapons / tech stolen can be found here...
http://www.washingtonpost.com/world/national-security/a-list-of-the-us-w...
The Pentagon views cyber attacks as an act of war according to this article in the WSJ written back in 2011...
http://online.wsj.com/article/SB1000142405270230456310457635562313578271...
Use the resources at your disposal to figure out who (insert country here) is responsible for this. Then hold them accountable. I would think this should be considered a serious breach of national security...