The basic structure of Kriegsmarine uniforms and insignia was divided into 5 categories of personnel: * Matrose (Seaman): Enlisted personnel, usually serving for a short term of enlistment * Maat: Technical specialist, the equivalent of a Petty Officer * Feldwebel: Sergeants, sometimes referred to as Matrosenfeldwebel or literally "Sailor Sergeants". * Marine Offizier: Naval Officers * Admiral: Flag Officers