REMEMBER…….

I watched a PBS program about the ghost army in WW2. I was aware of the dummy equipment and camouflage developed then but sigintel was also used along with recorded sounds of equipment/troops, etc. As with most pbs stuff it's not available online but I think it's covered in this article. Imagine intentionally trying to draw fire to give the real invaders cover!

https://www.history.com/news/ghost-army-world-war-ii