Relying on WWII-Era Communications...
Yelling out the tenement window??
“Norton! NORTON! WILL YOU GET DOWN HERE ALREADY???”
About five years ago, some agency of the German government started using typewriters so the NSA (and others) couldn’t hack them.
“Yelling out the tenement window??”
They train for every contingency. A battle group must have comms, even at the most basic level.
No matter what.
They still use semaphore too. And practice it.