The US was last invaded in WW2 -- and I don't mean attacked, I mean invaded by a foriegn army -- when the Japanese attacked and held (for a while) Attu and Kiska in the Aleutian Islands. The US mainland was also shelled by a Japanese submarine, and ballons were used to carry incendiaries from Japan to the Pacific Northwest (with the intent of setting forest fires but, other than a couple of civilian deaths, not much other results).

As for these yahoos -- six guys are going to attack a military installation? Apparently they were going to stand at the fence and shoot from there -- yessir, that's a plan alright....