Screenwriter Stephen E. de Souza has a catch-all Latin American country called “Val Verde” he uses whenever a politically neutral country in that part of the world is required for one of his movies. (In Arnold’s Commando, John Matrix wiped out the entire military of Val Verde by himself.) I have made several Val Verdes in my brain that I’m in the process of putting down in writing, and which may become more than just an order of battle chart.
Cardona is the conventionally weakest OPFOR country and the closest to de Souza’s Val Verde in terms of theme. It draws from both South American and Southeast Asian influences (if I wanted to be really shameless, I could have it have large conveniently Spanish-speaking regions and equally large parts with native Asian languages.)
Cardona’s military is large in numerical terms but lightly equipped and is focused on internal control rather than external invasion. It also has no shortage of irregular groups of all shapes and sizes.
Named for the Seleucid Empire, Seleucia is a catch-all Middle Eastern OPFOR country. Like its namesake, it features terrain from the Mediterranean to the Altais. A diverse and fractious nation, it is at times (ie, when the scenario calls for it) a strong state and at times a weak one. But even at its conventionally weakest, it’s still more powerful in material terms than Cardona is.
Seleucia can be the opponent in everything from irregular warfare to Gulf War level major battles. It also can have nuclear weapons in some cases.
Named after a form of Germany, Teutonia is the developed western European country. The most technologically advanced of these states for the time period, it was once a world power and remains a continental one.
In addition, Teutonian exports are found all over the world, including in the other two mentioned countries. Teutonia is a nuclear power if the tech level of the scenario allows it.
All three will be elaborated on, possibly in prose form… (winks)