He then underwent a number of specialized training courses which included a torpedo course in Mürwik (1 April – 19 May 1937),torpedo course for cadets—Torpedolehrgang für Fähnriche an anti-aircraft artillery course at Wilhelmshaven (20 May – 7 June 1937),anti-aircraft artillery course for cadets—Fla-Waffenlehrgang für Fähnriche a pathfinder course for cadets at Kiel-Wik (8–12 June 1937),pathfinder course for cadets—Sperrlehrgang für Fähnriche a communication course for cadets at Mürwik again (13 June – 3 July 1937),communication course for cadets—Nachrichtenlehrgang für Fähnriche a naval infantry course for cadets at Stralsund (4–28 July 1937),infantry course for cadets—Infanterielehrgang für Fähnriche and lastly an artillery course for cadets at Kiel-Wik (29 July – 2 October 1937).artillery course for cadets—Artillerielehrgang für Fähnriche Suhren was then transferred to the destroyer Z3 Max Schultz (3 October 1937 – 29 March 1938) for further ship based training. On this assignment he was promoted to Oberfähnrich zur See (Senior Ensign) on 1 January 1938.
