sentences:  Once the Nazi government came to power and abandoned the treaty's restrictions, Dornier resumed production in Germany.The success of the Wal family encouraged the development of derivatives, and of more advanced successors, such as the Do 18, and Do 24 which saw service in several armed forces, including German, into World War II.Dornier's most important World War II military aircraft design was the Do 17, nicknamed "The Flying Pencil".