The vast majority of the fighting in World War II took place on the Eastern Front. By some estimates, 93% of all German casualties took place there. The total losses inflicted upon the Ukrainian population during the war are estimated at 6 million, including an estimated one and a half million Jews killed by the Einsatzgruppen, sometimes with the help of local collaborators. Of the estimated 8.6 million Soviet troop losses, 1.4 million were ethnic Ukrainians. Victory Day is celebrated as one of ten Ukrainian national holidays. The losses of the Ukrainian people in the war amounted to 40-44% of the total losses of the USSR.