During the cold war I was a tank-commander  on a norwegian Leopard-tank.   The radio-systems were the rugged  .SEM 25 type. Each of our tanks carried two sets, one for the platoon-use and one for the company-service.    The german radios served well, had a wonderfull modulation and was easy to use. 
Out in the shooting-range, when we had some time to wait, I used to listen to the ham-radio-guys, operating on the 26 - 30 Mhz.  
Sometimes , when the conditions  were good, I could listen to messages  1000 miles away, Portugal, Italy and so on.
Once a Leopard tank got submerged in a  bog.  It was dragged up again and cleaned , and got a total overhaul.   Many systems had to be shifted or repaired -  BUT the rugged  and waterproof SEM-25  radios functioned flawlessly!       We only had to clean the sets and turn them on - everything was ok!.