 "Grille", the last aviso built in Germany, was ordered as a state yacht for dictator Adolf Hitler and other elements of the Nazi regime.She was fitted with experimental high-pressure steam turbines to evaluate them for future warships.The ship was used in a variety of roles during her career with the "Kriegsmarine" (War Navy); in the late 1930s, in addition to her duties as a yacht, she was employed as a training ship and a target for torpedo training.