The Old Fighter's Chevron (Ehrenwinkel für Alte Kämpfer, Honor Chevron for Old Campaigners) was authorized for wear by all SS members who had joined the SS or any other NSDAP-affiliated organization before 30 January 1933 or any Austrian Nazi/Pro-Nazi organization prior to 12 February 1938.

General der Gebirgstruppe Franz Boehme and SS-Gruppenführer Josef "Sepp" Dietrich in Greece 1941, note the Old Fighter's Chevron worn by Dietrich
(Courtesy of Bundesarchiv/Wikimedia, licensed under Creative Commons Attribution ShareAlike 3.0 Germany)

Sources used

John R. Angolia - Cloth insignia of the SS