Zero Days (2016)
Michael Hayden: Look, for longest time, I was in fear that I couldn't say the phrase Computer Network Attack. This stuff is hideously over classified and it gets into the way of a mature public discussion as to what it is we as a democracy want our nation to be doing up here in the cyber domain. Now, this is the former director of NSA and CIA saying this stuff is over classified. One of the reasons it's highly classified as it is: this is a peculiar weapon system. This is the weapon system that's come out of the espionage community, and so those people have a habit of secrecy.