In 1945, two communities in Texas found giant balloons in their fields. Though it was mostly covered up by the US, it turned out it was a failed attempt by the Japanese to cause serious damage from a distance.

Resources:

https://en.wikipedia.org/wiki/Fu-Go_balloon_bomb
https://www.click2houston.com/weather/2019/11/18/balloon-bombs-over-texas-it-happened/

https://texasalmanac.com/topics/history/bombing-texas
https://tmd.texas.gov/the-long-proud-history-of-the-texas-state-guard-balloon-bombs-in-wwii
https://www.roadsideamerica.com/tip/8573
http://www.texasescapes.com/ClayCoppedge/Bombing-of-Desdemona.htm