They announced the big "jihad on all USB drives" back in 2009. There were factory shinkwrapped USB drives for sale on base which came pre-loaded with viruses; people would buy those, mark them as Secret, put them on SIPRnet, and then machines would be infected. It was lulztastic, actually.
I think once something hits a large enough scale, they announce it; it's the easiest way to communicate to the affected DoD community (military, contractors, etc.), at which point it is basically public knowledge.
I think once something hits a large enough scale, they announce it; it's the easiest way to communicate to the affected DoD community (military, contractors, etc.), at which point it is basically public knowledge.