There is one way to test our communications are secure is to change frequencies.Set up special “war time” frequencies,monitor the frequencies,monitor the satellite codes,check time intervals or set up a cryptographic system.
We have frequency hopping sincgars radios of course and we presume that they are secure. Maybe they are, maybe they aren’t. I think the system is old enough now that russian and/or Chinese intelligence agents have had time to thoroughly investigate the technology. Russia and China both have plenty of money and competent computer programmers these days.