German Passenger Liners Prinz Eitel Friedrich and Kronprinz Wilhelm (left) Interned at the Philadelphia Navy Yard, Pennsylvania, prior to the U.S. entry into World War I. They are still flying German flags. During 1917-19, these ships respectively served as USS De Kalb (ID # 3010) and USS Von Steuben (ID # 3017). Note U.S. Navy target raft at right. Courtesy of Paul H. Silverstone, 1983. U.S. Naval History and Heritage Command Photograph.