These men, several of them centenarians by now, have built a giant tower which emits an electromagnetic pulse, disabling any approaching aircraft and disrupting radio communications, so they never got the news that the war was over.
These men, several of them centenarians by the time of the game, had been building a superweapon for the Imperial Japanese Army, a giant tower which emits an electromagnetic pulse, disabling any approaching aircraft and disrupting radio communications. Thus, they never got the news that the war was over.