I've been looking for a reference to something I distinctly remember following the fall of the USSR. The files from the KGB were released to the public, and someone found a study looking at what would be required to invade the continental USA. The conclusion of the study was that it was not feasible due to the number of firearms in the hands of private citizens.
I can't find any references to it online, but my brain is a stickler for details like that. I know I read it. Does anyone else recall or have a reference to this?