What MOS is this is Marines?

You are correct about the army SF, i know that that there are or were some seals that were doing it also. As far as the marines i dont belive it is called MOS like it is in the army, i now that in the navy it is called your rate (mos) and as far marines doing that kind of work overseas i honestly have never heard of it, i have been deployed to iraq twice and afganistan once with the most recent being in 2007. There are what is called Marine Recon, and they are similar to army SF but i dont know if the also have started doing coalition force training unless it is more recent and i just havent herd about it, hope this help somehow