The first USS Kangaroo (SP-1284) was an armed motorboat that served in the United States Navy as a patrol vessel from 1917 to 1919.

Kangaroo was built as the private motorboat Herreshoff Hull # 316 in May 1917 by the Herreshoff Manufacturing Company at Bristol, Rhode Island, one of nine identical motor boats built in anticipation of eventual acquisition by the U.S. Navy from their private owners.

Her civilian owner, Henry A. Morse of Marblehead, Massachusetts, had named her Kangaroo by the time the U.S. Navy purchased her from him at Boston, Massachusetts, on 18 September 1917 for service as a patrol boat in World War I.

Assigned to the 1st Naval District, Kangaroo served on section patrol and inner harbor patrol in Penobscot Bay, Maine, until 14 October 1918, when she departed for Key West, Florida.

However, this proposed movement appears to have been cancelled, probably because of the armistice with Germany of 11 November 1918 that ended World War I and eliminated the need for more U.S. Navy patrol craft in Europe.