Gefreiter is a German, Swiss and Austrian military rank that has existed since the 16th century. It is usually the second rank or grade to which an enlisted soldier, airman or sailor could be promoted.
Feldwebel is a non-commissioned officer (NCO) rank in several countries. The rank originated in Germany, and is also used in Switzerland, Finland, Sweden, and Estonia. The rank has also been used in Russia, Austria-Hungary, occupied Serbia and Bulgaria.
Oberfeldwebel is the fourth highest non-commissioned officer (NCO) rank in German Army and German Air Force.
Stabsfeldwebel is the second highest Non-commissioned officer (NCO) rank in German Army and German Air Force. It is grouped as OR-8 in NATO, equivalent to a First Sergeant in the United States Army, and to Warrant Officer Class 2 in the British Army. Promotion to the rank requires at least twelve years total active duty, of which at least eleven years have elapsed since promotion to unteroffizier, with at least ten years since promotion to stabsunteroffizier, and nine years since promotion to feldwebel. In army/ air force context NCOs of this rank were formally addressed as Herr Stabsfeldwebel also informally / short Staber.
Unteroffizier is a junior non-commissioned officer rank used by the Bundeswehr. It is also the collective name for all non-commissioned officers in Austria and Germany. It was formerly a rank in the Imperial Russian Army.
Bootsmann is a naval rank used in some navies.
Unteroffizier(e) mit Portepee, also Portepeeunteroffizier(e) (transl. Non-commissioned officer(s) with sword knot), is the designation for German senior non-commissioned officers in the armed forces of Germany. The title derives from the French porte-épée ("sword bearer"), as senior enlisted men would historically carry a sword into battle.
In the German Wehrmacht, Hauptfeldwebel was not a rank but a position title, assignment or appointment, equivalent to the Commonwealth company sergeant major or U.S. company-level first sergeant. There was one such non-commissioned officer (NCO) in every infantry company, artillery battery, cavalry squadron, etc. He was the senior NCO of his subunit, but his duties were largely administrative and he was not expected to accompany his unit into an assault or a firefight.
Fähnrich zur See designates in the German Navy of the Bundeswehr a military person or member of the armed forces with the second highest Officer Aspirant rank. According to the salary class it is equivalent to the Portepeeunteroffizier ranks Bootsmann (Marine) and Feldwebel of Heer or Luftwaffe.
The rank insignia of the Federal Defence Forces indicate rank and branch of service in the German Army, German Air Force, or the German Navy.
Oberfähnrich zur See designates in the German Navy of the Bundeswehr a military person or member of the armed forces with the last or highest Officer Aspirant rank. According to the salary class it is equivalent to the Portepeeunteroffizier ranks Hauptbootsmann (Marine) and Hauptfeldwebel of Heer or Luftwaffe.
The ranks of the German Armed Forces,, were set up by the President with the Anordnung des Bundespräsidenten über die Dienstgradbezeichnungen und die Uniform der Soldaten on the basis of section 4, paragraph 3 of the Soldatengesetz. The Bundesbesoldungsordnung regulates the salary scales of all Federal office holders and employees including soldiers. The 'ZdV-64/10 – Abkürzungen in der Bundeswehr' gives the abbreviations and a list of the abbreviations.
Oberstabsbootsmann is the highest Non-commissioned officer (NCO) rank in the German Navy. It is grouped as OR9 in NATO, equivalent to a Master Chief Petty Officer in the United States Navy, and a Warrant Officer Class 1 in the British Royal Navy.
Stabsbootsmann is the second highest Non-commissioned officer (NCO) rank in the German Navy. It is grouped as OR8 in NATO, equivalent to First Sergeant, Master Sergeant, or Senior Chief Petty Officer in the US Armed forces, and to Warrant Officer Class 2 in the British Army and Royal Navy.
Oberfähnrich designates in the Heer of the Bundeswehr a military person or member of the armed forces with the last or highest Officer Aspirant rank. According to the salary class it is equivalent to the Portepeeunteroffizier ranks Hauptfeldwebel of Heer or Luftwaffe, and Hauptbootsmann of Marine.
Hauptfeldwebel 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.
Stabsgefreiter is the second highest rank of enlisted men in the German Bundeswehr, which might be comparable to Corporal (OR-4) in Anglophone armed forces.
Hauptbootsmann designates in the German Navy of the Bundeswehr a military person or member of the armed forces. It belongs to the particular rank group Senior NCOs with port épée.
Oberbootsmann designates in the German Navy of the Bundeswehr a military person or member of the armed forces. It belongs to the particular rank group Senior NCOs with port epée.
The military ranks of the German Empire were the ranks used by the military of the German Empire. It inherited the various traditions and military ranks of its constituent states.
Germany 
German Army 
German Air Force