 FACT: Oberleutnant Muesel calls SS officer Sessler by the rank of  "Hauptmann". This is a German Army rank, equal to Captain, but was  not used by the SS. The equivalent SS rank was "Hauptsturmfuhrer,"  or "head storm leader". However, Sesslers collar insignia is that  of an SS Obersturmfuhrer, equal to 1st Lieutenant, one rank below  Captain.