Rubuta ci gaba don wannan sakin layi - Bayan karshen yakin, Koehl ya yi suna ga kansa don bincikensa game da National Socialism, musamman na nazarin Heinrich Himmler a matsayin Kwamishinan Reich don Ƙarfafa Ƙasar Jamusanci, da kuma aikin farko a kan Nazi Jamus a lokacin da aka mallaki Poland (1939<unk>1945)
Ka yi haƙuri. Koehl ya kirkiro kalmar "neofeudalism" don halayyar mulkin gurguzu na kasa, kuma ya kammala lissafin tarihin SS a shekarar 1983.