The Croatian War of Independence happened between 1991 and 1992 (although the peace treaty was signed in 1995, there were no battles after 1992) and not between 1992 and 1995 like the characters often repeat in this episode. The war fought on the territory of Yugoslavia between 1992 and 1995 was the Bosnian Civil War.
The insignia worn by Marko Stojpanovic is not that of the Army of the Republic of Croatia, but of the opposing army of Yugoslavia (JNA).
There is no such surname as Stojpanovic. The most similar surname to that is Stjepanovic.