Roba's « KG 100 Wiking, L'Escadre au Drakkar » in Annexe III has this to say of Hetzel:
Hetzel, Ernst, Maj. Born 19 September 1910 in Stuttgart … In December 1940 tranferred to I./KG 40 as TO. February 1942 to KGS 3 in Cognac and in June 1942 Kommandeur of III./KGS 3. Shortly afterward led Erpobungskommando 21 which became III./KG 100. In July 1943 left to command Erpr.Kdo. 36 and received the Ritterkreuz on 20 April 1945. Died in Hechingen, 27 June 1973.