Drill pay was authorized for the first time. The National Defense Act Amendments of 1920 This act established that the chief of the Militia Bureau (later the National Guard Bureau) would be a National Guard officer, that National Guard officers would be assigned to the general staff and that the divisions, as used by the Guard in World War I, would be reorganized. The National Guard Mobilization Act, 1933 Made the National Guard a component of the Army.