Here's some additional information on U-Boat crew makeup, from the same resource
U-Boats: The Illustrated History of the Raiders of the Deep by David Miller (2000 by Pegasus Publishing, republished by Brassey's, Washington DC):
Quote:
The Crew
The second-in-command was designated the Erste Wach Offizier (= first watchkeeping officer [IWO]) and was usually an Oberleutnant zur See, whose primary responsibility was to understudy the CO, so that he could take command if his superior became ill or died. His responsibilities included the boat’s primary weapons system: the torpedoes, and their control and aiming systems. Normally the only other deck officer was a very junior Leutnant zur See, designated Zweite Wach Offizier (= second watchkeeping officer [2WO]), who was responsible for the deck and Flak weapons, and also oversaw the communicators.
The other commissioned officer on most U-boats was the Leitender Ingenieuer (= leading engineer [LI]), an experienced officer (sometimes more experienced than the CO), whose action station was in the main control room. His responsibilities included engines, motors, batteries and the trim, and he also set the demolition charges if the boat had to be scuttled. This meant that he was the last to leave and a number of LIs died as a result, some of them intentionally…Junior engineering officers were sent to sea for one voyage under an experienced engineer before being given a boat of their own.
The enlisted men were led by four chief petty officers. The Obersteuermann was responsible for navigation and provisioning. The Oberbootsmann (boatswain [bosun]) was responsible for the discipline and, generally, dealt with such matters himself, referring only the most serious or intractable problems to the CO. The technical department was headed by the LI who was assisted by the Obermaschinist, who was responsible for the diesels and the Elektro Obermaschinist who was responsible for the electric motors and the battery.
The rest of the crew was made up of Unteroffiziere (petty officers) and various types of specialist: Mechaniker (mechanics; e.g. for torpedoes); Machinisten (machine-men [stokers]); Bootsmänner (bosuns); Funkmaat (radiomen); and the general duty sea-men, Matrosen. COs were often able to take some of their most trusted crewmen with them when they moved to a new boat.
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