Most likely all the mods require the expansions but I thought I'd try. I installed a few mods from ghostrecon.net but they did not work (one even screwed up the original campaign forcing me to re-install to a *different* directory!) (SFOR 2010, Long Haul, Back to Kosovo).
Anybody know of any good mods or extra missions/campaigns that work for our GOG version?

I still have to play this game, so I haven't tested any mods for it.
You can find a lot of mods here.