In WWII, Japan's highest ranking naval officer was Isoruku Yamamoto. Although he was Japanese, and his loyalties were unquestionably with The Empire, he studied for many years in America, graduating from Harvard University. There is an oft-repeated (and sometimes disputed) quote attributed to him regarding the possibility of any nation taking a war to American soil:
"You cannot invade the mainland United States. There would be a rifle behind every blade of grass."
Here is why he was correct:
The state of Wisconsin has gone an entire deer hunting season without someone getting killed. That's great, considering there were over 600,000 hunters that got permits this year.
Allow me to restate that number.
Over the last two months, the eighth largest army in the world - more men under arms than Iran; more than France and Germany combined - deployed to the woods of a single American state to keep the deer population under control.
But that pales in comparison to the 750,000 who are in the woods of Pennsylvania this week. Michigan's 700,000 hunters have now returned home. Toss in a quarter million hunters in West Virginia, and it is literally the case that the hunters of those four states alone would comprise the largest army in the world.
And that is just FOUR states.
The total population of registered hunters in America today ranges from 23 million to 43.7 million individuals. (Based on annual data provided by the U.S. Fish and Wildlife Service.)
As long as the American Hunter retains his right to Bear Arms, America will forever be safe from foreign invasion of troops.