I wholeheartedly agree as well. The only nitpick I'd have on this incredible dissertation is on the "U" association with "U-boat" - this is an anglicized form of the German word "Unterseeboot" (undersea boat) which was itself shortened to "U-boot" (presumably the etymology of the Swedish "ubåt"). The first known use of the term "U-boat" is 1914, while the Germans and Swedish armed forces were commissioning submarines around a decade prior (in 1906 and 1904 respectively).