I can't help but think this is some sort of trick. I've never been in the military, but does ANY modern military use unencrypted comms while on the battlefron

I can't help but think this is some sort of trick. I've never been in the military, but does ANY modern military use unencrypted comms while on the battlefront? It doesn't make a lot of sense, especially when you know where you are fighting, the enemy speaks your language and even were part of the same fighting force in living memory.