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It looks like the army and RAND Corporation are bringing back tabletop war gaming again. After the invention of the atomic bomb, tabletop miniature war games were seen as largely pointless for real military strategy training. They had been in use since the late 1700s in Prussia (and subsequently spread worldwide) for that purpose. They were created through slowly evolving chess to be more and more realistic. But after the atomic bomb, miniatures wargaming was consigned to the tabletop hobby world alone. Hobbyists continued playing tabletop war games simply because they were very fun and extremely challenging. Meanwhile RAND came up with the idea of "role playing" games as the best way to simulate modern warfare for the purpose of military training. Participants would now play the roles of leaders of countries with nuclear weapons at their disposal. Then the participants would basically negotiate their way to victory. No table or miniatures were required. The most popular hobbyist tabletop game to come out of this idea was Diplomacy.

First Edition of Dungeons and Dragons

In 1974, Gary Gygax and Dave Arneson applied the role play idea to miniatures medieval wargaming rules Gygax had developed earlier (which included Tolkien (Lord of the Rings) fantasy creatures as options for combatants). They also added in the idea of characters improving through experience (which had already been in miniatures wargaming in somewhat embryonic forms). And boom! Dungeons and Dragons was born, changing hobby tabletop gaming (and the electronic gaming that arrived soon after) forever.

And now the circle is completing itself as tabletop wargaming, with role playing involved, is going to be used once again in the military. Contrary to the predictions after World War II, the world still does conventional war these days, and thus tabletop wargaming is still applicable in a nuclear world for strategic modeling and training. Of course this new generation of tabletop wargames the military is doing will be highly advanced compared with the games they were playing pre-WWII, and will have computers sitting nearby crunching numbers... History is fascinating in how it so often follows spiraling paths.

Here is an article about it: link