Atropia, Gorgas, and Limaria are fictional nations in the Decisive Action Training Environment that the US Army fights in regularly. The 1,000 page publicly-released document I have says that it is conducted in Fort Leavenworth Kansas, though I have seen reports that Fort Polk in Louisiana also uses that program. It is built on a real world map of the Caucasus region, though every single nation is fictional. Sometimes the fiction is very thin, but it is fictional. The previously mentioned nations are border states between two, sometimes three depending on which version of DATE is followed, powerful neighbors who do not like each other. The border states are constantly in some level of conflict with each other, or their neighbors, giving the US Army a great deal of scenarios to play with when it comes to their training.