Yes, the Waffen-SS was the first modern pan-European military force. German, French, Spanish, Dutch, Croatian, Estonian, Latvian, Russian, etc. They even had some turncoat Brits they recruited from POW camps.
There’s a great scene in the movie “Soldier of Orange” where the Dutch volunteer for the Waffen SS, is in Russia and bites it on the toilet when a partisan tosses in a hand-grenade.
Note, no Poles! Why, the Germans weren’t stupid, they knew the first thing a Pole would do if they give him a rifle would be to shoot the German with it.