As the official standard-bearer of the Blutfahne, an iconic flag of the Nazi movement that had become bloodstained during the Munich Putsch in 1923, Grimminger often appeared close to Hitler in photographs and during ceremonies.

[2] Grimminger was born in Augsburg, Kingdom of Bavaria and entered the Imperial German Army when he was sixteen years old.

Grimminger was promoted during his service in the SA and the SS, finally reaching the rank of SS-Standartenführer (equivalent to colonel).

[5] Grimminger survived World War II, and was put on trial by the Allies in 1946 for being a member of the SS and ceremonially carrying the Blutfahne for nineteen years as a part of the propaganda of the Nazi Party.

In the later years of his life, he reportedly attempted to enter politics, and served as a Councillor in Munich, though his past prevented him from continuing this career.