In Third reich, Concentration camps were guarded by special SS units. The most of them were Germans, but there were many Ukrainians, Lithuanians and others.
Hitler's Balkan Waffen SS units were Croats, Muslims and Albanians. They were guarding the transports towards the death camps.
There were no Serbs in SS. What you claim is not supprted by the hard historical facts.
I have no idea what kind of WWII documentaries you have seen. I have seen Martians on TV landing close to The White House (Cross my heart, it was on Sci-Fi channel)
In all fairness, DustyMoment recognized his mistake and stated so in post #26.
I have to give him a lot more credit for admitting a mistake than is typical on most threads.