The only deaths of Americans on continental US soil occurred in Oregon on May 5, 1945 (incidentally, this was the wedding day of my grandparents). A Sunday school teacher and her five students investigated a downed balloon, and it exploded. All were killed. It was part of the Japanese Fu-Go campaign. After discovering jet streams, the enemy ingeniously developed balloons that could follow it and maintain its altitude on its own. Over 400 out of 9,000 balloons made it to America, and some made it all the way to Nebraska. But these were the only causalities. Have you heard of the Fu-Go campaign? What do you think of the ingenuity involved?