Thereafter, the SA became overshadowed by the SS; by 1939 it had little remaining significance in the Nazi Party. In January 1939, the role of the SA was officially established as a training school for the armed forces, with the establishment of the SA Wehrmannschaften (SA Military Units).[37] With the start of World War II in September 1939, the SA lost most of its remaining members to military service in the Wehrmacht (armed forces).[38]