Regarding guns and chat bots. You've said as much and the origin of the discussion says as much. Where does anyone suggest they are referring to use of LLMs in military deployments other than you?
A gun doesn't kill a person without being driven to action by a human. There are numerous alternative weapons to use, like using a candlestick in the conservatory or a rope in the lead pipe in the study for example.
Of course you can. AI has been deployed in multiple military campaigns.