If you haven’t seen this video where Owen Stephens tells the story of the time he was running a Star Wars RPG playtest and an (probably World War II) British Lieutenant showed up to the table, it’s well worth the six minutes:
I really love that they blast through the material because the Lieutenant, being an officer, does what an officer does: he leads them. He lays out plans which make sense and in which the boys at the table can see their parts and so they do what people do in the presence of a competent leader: they follow. And together, they did what people cooperating do: a lot more than they can do on their own.
I think my favorite part is when he explains to the boys at the table what a commando raid is.
There’s a lot that could be said about how young men need older men and it is one of the great follies of our civilization that we separate the two groups so completely, but I think it’s sufficiently obvious in this video that it actually does go without saying.