BAHAHAHA! "omgs! It was China! And they were after the nukes man!!! THE FLIPPING NUKES!!!!"
I'm not saying that the DOD is the brightest bulb on the Christmas tree, but I think they would be smart enough to keep terminals that can initiate nuclear launch commands off of the network, or at least in an extremely isolated network.
It's pretty classic to accuse the Chinese and to go overboard with stating that it was a nuclear missile system that was hacked, but along with the statement, there goes your credibility.