XV SS Cossack Cavalry Corps
The XV SS Cossack Cavalry Corps was a World War II cavalry corps of the Waffen-SS, the armed wing of the German Nazi Party, primarily recruited from Cossacks. It was originally known as the XIV SS Cossack Cavalry Corps from September 1944, after Helmuth von Pannwitz's 1st Cossack Cavalry Division of the Wehrmacht was transferred to the SS, before being renumbered as XV in February 1945.
Source: Wikipedia — XV SS Cossack Cavalry Corps (CC BY-SA 4.0)