Eventually, Schiffer joined the elite German military Waffen SS Corps and served from 1943 to 1945 as a prison guard at four concentration camps -- Sachsenhausen and Hersbruck in Germany and Majdanek and Trawniki in Poland.
Sifer se na kraju pridružio elitnim nemačkim SS jedinicama i služio od 1943 do 1945 godine kao zatvorski čuvar u četiri koncentraciona logora -- u Sahsenhauzenu i Herzbruku u Nemačkoj i Majdaneku i Travniki u Poljskoj.