Here's a way to change the default nationalities in FA. Open the FA executable (FA.exe) using a hex editor,( you can get freeware hex editors on the net, and if you are not familiar with hex editing, it would be a good idea to make a backup copy of FA.exe first ) then, using the "find" and "find next" functions of the hex editor, search for every instance of the nationality you would like to replace, and overwrite each entry with the new nationality. That's it! Simple! Just make sure the nation you are replacing has the same or more number of letters than the new one, and overwrite any extra letters with "00" number entries in the hex editor. Try it! Your new nationality will show up on both the Quick Mission and PMC screens!
Rich