But the Legion wasn't made up for the sake of silliness. Caesar chose this template of history for a reason to model his organization after. Don't forget that most people in the wasteland have absolutely no idea any more about their own history, they know there was a war that created the current world and that before that things were better (well they think that of course). They don't know about classical empires or repeating patterns in history. Their gear may be a bit absurd but for the rest they are deadly serious.