Non-commissioned officer
Hauptfeldwebel (HptFw or HF; ) is the third highest Non-commissioned officer (NCO) grade in German Army and German Air Force. It is grouped as OR-7 / OR-8 in NATO, equivalent to US Army Sergeant 1st Class and Master Sergeant. In army/ air force context NCOs of this rank were formally addressed as "Herr Hauptfeldwebel" also informally / short "Hauptfeld".