We do know that Hitler spent his birthday wearing a red armband, which all soldiers in Munich were required to wear. We also know that on April 20, d… - Thomas Weber

Hitler was picked as the representative of the men in his company. He now held a position that existed to serve, support, and sustain the left-wing revolutionary regime. Hitler’s task was to help facilitate the smooth running of the regiment. If we can believe an article published in March 1923 in the Münchener Post—a partisan Social Democratic newspaper but one that was generally well informed about the nascent National Socialist movement—his responsibilities eventually went further than that. According to the article, he also acted as a go-between with the propaganda department of this regiment and the revolutionary regime. The article claimed that Hitler took an active role in the work of the department, giving talks and made the case for the republic.

As the rope tightened around the neck of the Soviet Republic in late April, life for any real or perceived counterrevolutionaries left in Munich grew very dangerous indeed. For instance, on April 29 and the following day, revolutionaries showed up at the neoclassical palace on Brienner Straße that housed the papal nunciature, entering the building and threatening the nuncio, Eugenio Pacelli, with guns, daggers and even hand grenades. Pacelli was hit so hard in his chest with a revolver that it deformed the cross that he carried on a chain around his neck. The attack on the future Pope Pius XII was not the only reported case of aborted action taken against real or perceived adversaries of the Soviet Union.

In theory, all Munich-based military units and thus Hitler’s regiment, too, were part of the Red Army. In that sense, Hitler served in the Red Army. In reality, however, most regiments neither actively supported the Soviet regime nor opposed it.