Reichsführer-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 by far most noteworthy "Reichsführer-SS" was Heinrich Himmler.