![Oberleutnant zur See Otto Kümpel - German and Austrian U-boats of World War One - Kaiserliche Marine - uboat.net Oberleutnant zur See Otto Kümpel - German and Austrian U-boats of World War One - Kaiserliche Marine - uboat.net](https://uboat.net/media/wwi/men/commanders/kumpel_otto.jpg)
Oberleutnant zur See Otto Kümpel - German and Austrian U-boats of World War One - Kaiserliche Marine - uboat.net
![File:UNIFORMEN DES REICHSHEERES UND DER REICHSMARINE Uniformtafel aus Brockhaus Enzyklopädie (Brockhaus IV) Uniforms and rank insignia of the German army and navy Book plate chart (ca 1921-1935) No known copyright restrictions.jpg - File:UNIFORMEN DES REICHSHEERES UND DER REICHSMARINE Uniformtafel aus Brockhaus Enzyklopädie (Brockhaus IV) Uniforms and rank insignia of the German army and navy Book plate chart (ca 1921-1935) No known copyright restrictions.jpg -](https://upload.wikimedia.org/wikipedia/commons/5/5e/UNIFORMEN_DES_REICHSHEERES_UND_DER_REICHSMARINE_Uniformtafel_aus_Brockhaus_Enzyklop%C3%A4die_%28Brockhaus_IV%29_Uniforms_and_rank_insignia_of_the_German_army_and_navy_Book_plate_chart_%28ca_1921-1935%29_No_known_copyright_restrictions.jpg)
File:UNIFORMEN DES REICHSHEERES UND DER REICHSMARINE Uniformtafel aus Brockhaus Enzyklopädie (Brockhaus IV) Uniforms and rank insignia of the German army and navy Book plate chart (ca 1921-1935) No known copyright restrictions.jpg -
![File:F.W. Assmann & Söhne Lüdenscheid 104 Uniformköpfe Abzeichen. Uniform insignia catalog Nazi Germany 1930s WEHRMACHT LUFTWAFFE HEER REICHSMARINE Tropenhelm-Beschlag. No known copyright. CC BY-SA license.jpg - Wikimedia Commons File:F.W. Assmann & Söhne Lüdenscheid 104 Uniformköpfe Abzeichen. Uniform insignia catalog Nazi Germany 1930s WEHRMACHT LUFTWAFFE HEER REICHSMARINE Tropenhelm-Beschlag. No known copyright. CC BY-SA license.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/0/0a/F.W._Assmann_%26_S%C3%B6hne_L%C3%BCdenscheid_104_Uniformk%C3%B6pfe_Abzeichen._Uniform_insignia_catalog_Nazi_Germany_1930s_WEHRMACHT_LUFTWAFFE_HEER_REICHSMARINE_Tropenhelm-Beschlag._No_known_copyright._CC_BY-SA_license.jpg)