Mustn’t doesn’t apply now. Seven years after Macgregor wrote this we find out on the Uke battlefields and in the Red Sea that the ambushed happened while we weren’t paying attention. I don’t know about you but I’m stunned by the vulnerability of weapon systems we’ve invested so heavily in. Gunboat diplomacy is kaput and drones have been like introducing the Maxim machine gun. It’s a whole new ballgame.