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SS Kronprinzessin Cecilie was an ocean liner built in Stettin, Germany in 1906 for Hapag-Lloyd that had the largest steam reciprocating machinery ever fitted in a ship at the time of construction. The last of four ships of the Kaiser class, she was also the last German ship to have been built with four funnels. She was engaged in transatlantic service between her home port of Bremen and New York until the outbreak of World War I.
On 4 August 1914, at sea after leaving New York, she turned around and put into Bar Harbor, Maine, where she later was interned by the neutral United States. After that country entered the war in April 1917, the ship was seized and turned over to the United States Navy, and renamed USS Mount Vernon (ID-4508). While serving as a troop transport, Mount Vernon was torpedoed in September 1918. Though damaged, she was able to make port for repairs and returned to service. In October 1919 Mount Vernon was turned over for operation by the Army Transport Service in its Pacific fleet based at Fort Mason in San Francisco. USAT Mount Vernon was sent to Vladivostok, Russia to transport elements of the Czechoslovak Legion to Trieste, Italy and German prisoners of war to Hamburg, Germany. On return from that voyage, lasting from March through July 1920, the ship was transferred to the United States Shipping Board and laid up at Solomons Island, Maryland until September 1940 when she was scrapped at Boston, Massachusetts.