One of the examples was the night before the '91 Desert Storm started. For those that weren't around, there was a huge build up operation called Desert Shield and only became Desert Storm when they started shooting. It's not like that was a secret, and the Iraqis could have seen this data and not be surprised when the bombs start falling immediately after the pizza surge.
If you were bin Laden, maybe you might not have been caught unawares helicopters were about to crash in your garden. It's not like you didn't know they were looking for you.
I can't think of someone that the Pentagon or other agencies that this applies to that their adversaries would not know they were the adversary. This might be more relevant than you might think