This Day in U.S. Naval History – December 6
1830 - Naval Observatory, the first U.S. national observatory, established at Washington, DC, under commander of Lieutenant Louis Malesherbes.
1901 - First report of Ship Model Basin at Washington Navy Yard issued by Naval Constructor David W. Taylor who designed the basin. First facility of this type in U.S. to test hull shapes.
1917 - German submarine torpedoes sink USS Jacob Jones (DD-61) off England.
1968 - Operation Giant Slingshot began in Mekong Delta
(Source: Navy News Service)