Here’s how they hid Aircraft Factories during WW2.

[Justdroppedin]

https://i.redd.it/ft4s8d2v6be51.jpg

[Gabacho]

A fantastic undertaking.

[dogdayz]

Don't forget the deception of the Germans with the inflatable brigade in France. The allies used inflatable tanks and recorded sounds to make the Germans think the force was much larger than it really was.
https://cdn.theatlantic.com/static/mt/assets/science/assets_c/2013/05/tanklift-thumb-570x370-122303.jpg