Question: Located in a shipyard to the southeast corner of San Francisco, the USS Mahan was a "Farragut"-class guided missile destroyer that was launched on what date?
Context: USS "Mustin" (DDG-89) is an "Arleigh Burke"-class guided missile destroyer in the United States Navy.  She is named in honor of the Mustin family who has devoted nearly a century of U.S. Naval service.  This ship is the 39th destroyer of its class.  USS "Mustin" was the 18th ship of this class to be built at Ingalls Shipbuilding in Pascagoula, Mississippi, and construction began on 15 January 2001.  She was launched on 12 December 2001 and was christened on 15 December 2001.  On 26 July 2003, a twilight ceremony was held at the Naval Air Station North Island in San Diego, California.  She is part of Destroyer Squadron 15, based at Yokosuka, Japan. The San Francisco Naval Shipyard was a United States Navy shipyard in San Francisco, located on 638 acre of waterfront at Hunters Point in the southeast corner of the city. USS "Dahlgren" (DLG-12/DDG-43) was the 7th ship in the "Farragut"-class guided missile destroyer in the United States Navy.  She was launched on 16 March 1960 by Philadelphia Naval Shipyard and sponsored by Mrs. Katharine D. Cromwell, granddaughter of Rear Admiral John Adolphus Dahlgren.  She was commissioned on 8 April 1961, Commander C. E. Landis in command.  It was the third ship in the Navy to bear the name.  Commissioned as DLG-12, "Dahlgren" was reclassified a guided missile destroyer on July 1, 1975 and given the new hull number DDG-43.  The ship saw service until 1992, when she was placed in reserve.  She was sold for scrapping three times, the first time in 1994, but was repossessed twice as the ship breaking companies failed.  The ship was finally dismantled in 2006. Holly Ann Graf is a retired Captain in the United States Navy.  Until January 2010 she was commanding officer of the "Ticonderoga"-class guided missile cruiser USS "Cowpens" (CG-63), a major surface combatant vessel of the fleet.  She was the first woman to command a cruiser in the history of the U.S. Navy.  Earlier, she had been the first woman in the U.S. Navy to command a destroyer when she served as skipper of the guided missile destroyer USS "Winston S. Churchill" (DDG-81).  Her personal decorations include the Legion of Merit and the Bronze Star, among others.  Graf was relieved of command for abusive behavior unbecoming of an officer and was featured in Time magazine that characterized her as a modern-day female "Captain Bligh."  The US Navy forced Graf into early retirement in 2012, but allowed her to do so at her current rank of Captain and under "honorable circumstances." USS "Lassen" (DDG-82) is an "Arleigh Burke"-class guided missile destroyer in the United States Navy.  She is named for Medal of Honor recipient Commander Clyde Everett Lassen.  This ship is the 32nd destroyer of its class.  USS "Lassen" was the 14th ship of this class to be built by Ingalls Shipbuilding at Pascagoula, Mississippi, and construction began on 24 August 1998.  She was launched and christened on 16 October 1999.  On 21 April 2001, she was commissioned at the Florida Aquarium Pier in Tampa, Florida.  She was homeported in San Diego until she shifted homeport to Yokosuka Naval Base in Yokosuka, Japan in August 2005.  In January 2016, she moved to Naval Station Mayport in Mayport, Florida.  According to the Standard Navy Distribution List, March 2016, at that time she was assigned to the new Naval Surface Squadron 14. USS "Cole" (DDG-67) is an "Arleigh Burke"-class Aegis-equipped guided missile destroyer homeported in Naval Station Norfolk, Virginia.  "Cole" is named in honor of Marine Sergeant Darrell S. Cole, a machine-gunner killed in action on Iwo Jima on 19 February 1945, during World War II.  "Cole" is one of 62 authorized "Arleigh Burke"-class guided missile destroyers, and one of 21 members of the Flight I-class that utilized the 5 in /54 caliber gun mounts found on the earliest of the "Arleigh Burke"-class destroyers.  The ship was built by Ingalls Shipbuilding and was delivered to the Navy on 11 March 1996. The 18 "Forrest Sherman"-class destroyers were the first US post-war destroyers (DD-927 to DD-930 were completed as destroyer leader configurations).  Commissioned beginning in 1955, these ships served until the late 1980s.  Their weaponry underwent considerable modification during their years of service.  Four were converted to guided missile destroyers.  This class also served as the basis for the "Charles F. Adams"-class guided missile destroyer. USS "Preble" (DLG-15/DDG-46) was a "Farragut"-class guided missile destroyer in the United States Navy.  She was the fifth, of now six ships, named to honor Commodore Edward Preble (1761–1807).  "Preble" was laid down by Bath Iron Works of Bath, Maine on 16 December 1957.  She was launched on 23 May 1959, sponsored by Mrs. Ralph E. Wilson.  "Preble" was commissioned at the Boston Naval Shipyard on 9 May 1960, Commander Edward G. Fitz-Patrick in command.  She was decommissioned on 15 November 1991 and struck 20 November 1992 to be scrapped. HMS "Hampshire" was a County-class destroyer of the Royal Navy.  Laid down, in March 1959 a couple of weeks behind the class leader "Devonshire" , she was classified as a guided missile destroyer, as the Sea Lords regarded the concept of the cruiser and big gun ship as discredited by the perceived failure of the "Tiger" class and the obsolescence of the heavy gun.  The description of guided missile destroyer seemed more likely to win approval from the Treasury and Government for an adequate number of warships the size of small cruisers, which could play many traditional cruiser flagship and command functions, but had no armour around its gun and missile magazine. USS "Mahan" (DDG-42), was a "Farragut"-class guided missile destroyer in the United States Navy.  She was named for Rear Admiral Alfred Thayer Mahan USN (1840–1914).  The ship was Laid down as DLG-11 by the San Francisco Naval Shipyard on 31 July 1957 and launched on 7 October 1959.  "Mahan" was sponsored by Mrs. H. P. Smith, wife of Vice Adm. Harold Page Smith, and commissioned on 25 December 1960.  "Mahan" was reclassified as a guided missile destroyer on 30 June 1975 and designated DDG-42.  USS "Mahan" was decommissioned on 15 June 1993 and stricken from the Naval Vessel Register on the same day.
Answer: 7 October 1959