O9
Encyclopedia
O9 may refer to:
- USS O-9 (SS-70)USS O-9 (SS-70)USS O-9 was an O-class submarine of the United States Navy. Her keel was laid down on 15 February 1917 at Fore River Shipbuilding Company of Quincy, Massachusetts. She was launched on 27 January 1918 sponsored by Mrs. Frederick J. Sherman, and commissioned on 27 July 1918 with Lieutenant Oliver M....
, an O-class submarine of the United States Navy - Douglas O-9, a variant of the Douglas O-2, a 1920s American observation aircraft