[watmough]

Not sure why you are being downvoted, there are many worries about exactly this, compromise of components used in the US military, when imported from foreign countries.

http://www.dailymail.co.uk/news/article-2058849/Chinese-coun...

Also, it seems highly likely that most US secrets including drone control systems are likely to have been compromised by hackers.

http://www.geek.com/articles/geek-pick/chinese-hackers-took-...

http://articles.cnn.com/2009-04-21/us/pentagon.hacked_1_plan...