Erich Raeder and Karl Dönitz both reached what rank in the German Navy?
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Erich Raeder Erich Raeder (24 April 1876 – 6 November 1960) was a naval leader in Germany who played a major role in the naval history of World War II. Raeder attained the highest possible naval rank—that of Grand Admiral — in 1939, becoming the first person to hold that rank since Alfred von Tirpitz. Raeder led the "Kriegsmarine" for the first half of the war; he resigned in 1943 and was replaced by Karl Dönitz. He was sentenced to life in prison at the Nuremberg Trials, but was released early due to failing health.
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Karl Dönitz Karl Dönitz (sometimes spelt Doenitz) (] ; 16 September 1891 – 24 December 1980) was a German admiral who played a major role in the naval history of World War II. Dönitz briefly succeeded Adolf Hitler as the head of state of Germany.
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Hansjürgen Reinicke Hans-Jürgen "Hansjürgen" Rudolf Reinicke (10 August 1902 – 29 January 1978) was a "Kapitän zur See", commander of heavy cruiser "Prinz Eugen", in Nazi Germany's "Kriegsmarine" during the Second World War and recipient of the Knight's Cross of the Iron Cross.
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Herbert Schultze Herbert Emil Schultze (24 July 1909 – 3 June 1987), was a German U-boat (submarine) commander of the "Kriegsmarine" (the German navy in World War II). He commanded "U-48" for eight patrols during the early part of the war, sinking  gross register tons (GRT) of shipping and earning him eighth place on the Aces of the Deep list.
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Hans von Koester Hans Ludwig Raimund von Koester (29 April 1844 – 21 February 1928) was a German naval officer who served in the Prussian Navy and later in the Imperial German Navy. He retired as a Grand Admiral.
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Georg Alexander von Müller Georg Alexander von Müller (March 24, 1854 – April 18, 1940) was an Admiral of the Imperial German Navy and a close friend of the Kaiser in the run up to the First World War.
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Carl Hans Lody Carl Hans Lody, alias Charles A. Inglis (20 January 1877 – 6 November 1914; name occasionally given as Karl Hans Lody), was a reserve officer of the Imperial German Navy who spied in the United Kingdom in the first few months of the First World War.
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Kaiser-class battleship The "Kaiser" class was a class of five battleships that were built in Germany prior to World War I and served in the Imperial German Navy during the war. They were the third class of German dreadnoughts, and the first to feature turbine engines and superfiring turrets. The five ships were "Kaiser" , "Friedrich der Grosse" , "Kaiserin" , "Prinzregent Luitpold" , and "König Albert" . As was usual for German battleships of the period, the "Kaiser" class mounted main guns that were smaller than those of their British rivals: 30.5 cm , compared to the 34.3 cm guns of the British "Orion" class .
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Heinrich Bleichrodt Heinrich Bleichrodt (21 October 1909 – 9 January 1977) was one of the most successful German U-boat commanders of the Second World War. From October 1939 until retiring from front line service in December 1943, he was credited with sinking 25 ships for a total of  gross register tons (GRT) . For this he received the Knight's Cross of the Iron Cross with Oak Leaves, among other commendations. He earned the nickname "Ajax" during his time with the U-boats.
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Fähnrich zur See Fähnrich zur See (Fähnr zS or FRZS) designates in the German Navy of the Bundeswehr a military person or member of the armed forces with the second highest Officer Aspirant (OA – de: Offizieranwärter) rank. According to the salary class it is equivalent to the Portepeeunteroffizier ranks Bootsmann (Marine) and Feldwebel of Heer or Luftwaffe.
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Walther Schwieger Kapitanleutnant Walther Schwieger (7 April 1885 – 5 September 1917) was a U-boat commander in the Imperial German Navy ("Kaiserliche Marine") during First World War. In 1915, he sank the passenger liner  with the loss of 1,198 lives.
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Leopold Bürkner Leopold Bürkner (29 January 1894 - 15 July 1975) was a German naval officer who served on torpedo boats in World War I. In the post-war period he served on a pocket battleship that patrolled the Spanish coast during the Spanish Civil War and then commanded a light cruiser. In 1938 he became head of the foreign liaison section of the Abwehr, the General Staff intelligence department. During World War II he rose to the rank of Vice Admiral.
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Hans Jenisch Hans Jenisch (19 October 1913 – 29 April 1982) was a "Kapitänleutnant" in Nazi Germany's "Kriegsmarine" during World War II and a "Kapitän zur See" in West Germany's "Bundesmarine". He commanded the Type VIIA U-boat "U-32" , sinking seventeen ships on seven patrols, for a total of  gross register tons (GRT) of Allied shipping, to become the 26th highest scoring U-Boat ace of World War II.
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Karl Galster Kapitänleutnant Karl Galster (born 29 March 1886 Berlin, died 25 March 1916) was a German naval officer killed in World War I.
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Waldemar Verner Waldemar Verner (August 27, 1914 in Chemnitz, Germany – February 15, 1982) was chief of the People's Navy (Volksmarine) of the National People's Army of the German Democratic Republic and brother of Paul Verner.
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Karl Witzell Karl Witzell (18 October 1884, Hiersfeld near Wesel – 31 May 1976, Berlin) was a German naval officer who rose to General Admiral and head of the Marinewaffenhauptamt during the Second World War.
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Günther Heydemann Günther Heydemann (11 January 1914 – 2 January 1986) was a German U-boat commander in the Kriegsmarine of Nazi Germany in World War II. He was a recipient of the Knight's Cross of the Iron Cross. Prior to taking command of "U-575" , Heydemann made two war patrols as watch officer on board "U-69" under the command of "Kapitänleutnant" Jost Metzler.
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Georg von Trapp Corvette Captain Georg Johannes Ritter von Trapp (4 April 1880 – 30 May 1947), often incorrectly referred to as Baron (Freiherr) von Trapp, was an Austro-Hungarian Navy officer. His naval exploits during World War I earned him numerous decorations, including the prestigious Military Order of Maria Theresa. Under his command, the submarines SM "U-5" and SM "U-14" sank 13 Allied ships totaling about  gross register tons (GRT) .
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Unterleutnant Unterleutnant (NPA-original abbreviation "Ultn."; en: translation "Under-lieutenant" or "sub-lieutenant") was an officer of the German Democratic Republic's army (e.g. the National People's Army from 1956–1990) of the lowest commissioned officer (CO) rank comparable to NATO rank codes OF1c. It belonged to the rank group of lieutenants or subaltern officers. The equivalent OF1c-rank of the Volksmarine was Unterleutnant zur See (en: "sub-lieutenant at sea").
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German battleship Gneisenau Gneisenau was a German capital ship, alternatively described as a battleship and battlecruiser, of Nazi Germany's "Kriegsmarine". She was the second vessel of her class, which included one other ship, "Scharnhorst" . The ship was built at the "Deutsche Werke" dockyard in Kiel; she was laid down on 6 May 1935 and launched on 8 December 1936. Completed in May 1938, the ship was armed with a main battery of nine 28 cm (11 in) C/34 guns in three triple turrets, though there were plans to replace these weapons with six 38 cm (15 in) SK C/34 guns in twin turrets.
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Ludwig von Reuter Ludwig von Reuter (9 February 1869 – 18 December 1943) was a German admiral during World War I who commanded the Imperial German Navy's High Seas Fleet when it was interned at Scapa Flow at the end of the war. On 21 June 1919 he ordered the scuttling of the fleet to prevent the British from seizing the ships.
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Graf Spee or to several German ships that were named after the admiral: