Sonderführer

Sonderführer (German: [ˈzɔndɐˌfyːʁɐ]; lit. "special leader"; in full: Sonderführer mit militärischer Kommandobefugnis, "special leader with military command power"), abbreviated Sdf or Sf, was a specialist role introduced in the Wehrmacht of Nazi Germany in 1937 for the mobilization plan of the German armed forces.