After finishing his studies at the
Gymnasium in
Munich, Weiss began a career as a
military officer in the
Bavarian Army. In 1911, he joined the 2nd Bavarian Foot Artillery Regiment as a
Fahnenjunker (ensign) and, by 1913, he was commissioned as a
Leutnant. During the
First World War, Weiss first fought on the front lines and then was transferred in 1915 to the
Luftstreitkräfte (air service) with Field Aviation Detachment 71. On one of his battle deployments, he was shot down, as a result of which he lost his left leg. In 1917, he was promoted to
Oberleutnant before being transferred to the
Bavarian War Ministry in 1918, shortly before the war ended. He was awarded the
Iron Cross, 1st and 2nd class and the
Bavarian Military Merit Order, 4th class. Through his activities in the Bavarian War Ministry's press department, Weiss came to a career in journalism after the war. In 1920, when the
Reichswehr, which was busy reconstituting itself, could no longer find a job for him, he was discharged with the rank of
Hauptmann. Already by 1919, Weiss had been busying himself as a member of the state leadership of the Bavarian
Citizens' Defense (
Einwohnerwehr), through which he was appointed editor of the magazine
Heimatland (
Homeland), a publication with strong
Nazi Party leanings. While a student at the
Ludwig-Maximilians-Universität München between 1918 and 1920, he was active in various
paramilitary organizations—including the
Einwohnerwehr, the
Deutsch-Völkischer Offiziersbund, the , the
Bund Reichskriegsflagge, the
Freikorps Oberland, and the
Frontbann—where he served under
Ernst Röhm as a staff officer for political affairs. He became involved early on in the
Völkisch movement and was a fervent devotee of
Adolf Hitler's ideas. Before 1933, the year of the NSDAP's
seizure of power, he was judicially sentenced many times for political misdeeds. However, after Hitler and the Nazi Party had come to power, Weiss organized the "
synchronization" of the press, though he also saw to it that individual journalists could keep their jobs despite the Editor Law (
Schriftleitergesetz). Weiss never questioned
Nazism. == Nazi Party career ==