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Reichsführer-SS ('Reich Leader-SS') was a special title and rank that existed between the years of 1925 and 1945 for the commander of the Schutzstaffel (SS). Reichsführer-SS was a title from 1925 to 1933, and from 1934 to 1945 it was the highest rank of the SS. The longest-serving and most noteworthy office holder was Heinrich Himmler.