The German Army of the Nazi era inherited its uniforms and rank structure from the Reichsheer of the Weimar republic (1921–1935), many of whose traditions went back to the Imperial Army of the German Empire and earlier. The Reichsheer was renamed Wehrmacht Heer in May 1935. There were few alterations and adjustments made as the Army grew from a limited peacetime defense force of 100,000 men to a war-fighting force of several million men.