Unfortunately, not everyone learns what not to do:
In 1991, one might have deduced the January 16 Desert Storm campaign by monitoring the influx of pizza deliveries to the Pentagon, according to current U.S. Army Operational Security (OPSEC) training materials.
https://www.wilsoncenter.org/publication/forecasting-nuclear-war
The key is a diversion — a lot of delivery orders from vegan restaurants.