Spathi, there are (I can't remember how many) UK and US forces in Syria, mainly in places where IS is.
But there are, on the ground, exceptionally brave peopole from the WHO and an organisation called the White Helmets, who go around conflict sites logging evidence of war crimes, or simply just evidence of fighting, in all areas, not just those attacked by government forces. They have lost over 200 volunteers since the start of the war: they get attacked, mainly by Assad'sa forces, who not unnaturally hate the fact that someone is doing what they do.
So there are, actually, a lot of people on the ground there.