From May to September 1942 he served as Martin Bormann's representative on General Walter von Unruh's staff, seeking to mobilize for total war and replenish losses of manpower. In this capacity, he traveled widely through the occupied eastern territories, including the General Government, Ostland and Ukraine. Hoffmann advised Hitler on the Holocaust. He gave insights into actions of the Einsatzgruppen murders and on the death camps of Operation Reinhard, on which he spoke at the Reich Chancellery. He made suggestions for improvement, or "Verbesserungsvorschlägen", to Hitler and Joseph Goebbels.