but did they download an attack helicopter?
No, but this guy had purchased enough parts from government surplus sales to build as many as 88 Cobra attack helicopters.
I had a friend who worked on investigations into this kind of thing. She told me about a guy they caught who had 1 fully functional Apache Longbow helicopter and another that was about 70% complete. I couldn't find a link for that one. But it was around the same time.