USS Pittsburgh (SSN 720), a Los Angeles-class submarine, was the fourth ship of the U.S. Navy to be named for Pittsburgh, Pennsylvania. The contract to build her was awarded to the Electric Boat Division of General Dynamics Corporation in Groton, Conn., on April 16, 1979, and her keel was laid down on April 15, 1983. She was launched on December 8, 1984, sponsored by Mrs. George Sawyer, and commissioned on November 23, 1985, with Cmdr. Raymond Setser in command.

January 5, 2003 The Pittsburgh recently departed Manama, Bahrain, after a routine port call.

March 20, USS Pittsburgh launched its first Tomahawk Land Attack Missiles (TLAMs) on targets in Iraq.

April 6, The Los Angeles-class attack submarine moored outboard the USS Emory S. Land (AS 39) in Souda Bay, Crete, for a four-day port call to get tender support services.

April 27, USS Pitsburgh returned to Groton after a seven-month deployment in support of Operation Iraqi Freedom. The sub departed in October 2002 for a scheduled deployment in the Mediterranean Sea, with the USS Harry S. Truman (CVN 75) Battle Group.

September 19, Cmdr. David J. Hahn relieved Cmdr. Jeffrey S. Currer as CO of the Pittsburgh during a change of command ceremony on board the sub at Naval Submarine Base New London.

October 21, USS Pittsburgh launched a Tactical Tomahawk Block IV cruise missile from the Atlantic sea range east of Jacksonville, Fla., to the test range at Eglin Air Force Base. The Tomahawk completed its fully guided 818-nautical mile flight using Terrain Contour Matching navigation. When the Tomahawk safely made it to the recovery site, its parachute recovery system was activated as planned.

April 1, 2005 The nuclear-powered attack submarine arrived in Portsmouth Naval Shipyard at Kittery, Maine, for a 16-month Engineered Overhaul (EOH).

April 28, 2008 SSN 720 arrived in Port Everglades, Fla., for a Navy Fleet Week.

February 4, 2009 USS Pittsburgh returned to Groton after a scheduled six-month deployment in the U.S. Southern Command and African Command Areas of Responsibility (AoR).

June 19, Cmdr. Michael K. Savageaux relieved Cmdr. Andrew C. Jarrett as CO of the Pittsburgh during a change-of-command ceremony at Naval Submarine Base New London's Shepherd of the Sea chapel.

September 28, 2010 USS Pittsburgh arrived in Portsmouth, England, for a scheduled port visit.

October 15, SSN 720 returned to Groton, Conn., after more than six-month deployment in the U.S. 6th Fleet AoR. During the underway period, the Los Angeles-class attack submarine traveled 30,000 miles and visited ports of Faslane, Scotland; Haakonsvern, Norway; and Brest, France.

March 9, 2011 The Pittsburgh pulled into Naval Submarine Base Kings Bay for a routine port call.

December ?, USS Pittsburgh departed homeport for a scheduled Middle East deployment.

April 22, 2012 The Los Angeles-class attack submarine is currently assigned to Commander, Task Force (CTF) 54, which commands U.S. submarine forces and coordinates theater-wide anti-submarine warfare in the U.S. 5th Fleet Area of Responsibility (AoR).

June 27, USS Pittsburgh returned to Naval Submarine Base New London after a six-month deployment.

August 3, Cmdr. Michael P. Ward, II relieved Cmdr. Michael K. Savageaux as CO of the SSN 720 during a change-of-command ceremony on board the sub in Groton.

August 10, Capt. Vernon J. Parks, Jr., Commander, Submarine Development Squadron (SUBDEVRON) 12, relieved of duty Cmdr. Michael Ward "due to a loss of confidence in his ability to command." Cmdr. Savageaux assumed temporary command of the Pittsburgh.

September 5, USS Pittsburgh recently entered the newly restored auxiliary floating dry-dock Shippingport (ARDM 4) at NSB New London for a 10-month Extended Drydocking Selected Restricted Availability (E-DSRA).

December 10, Cmdr. William E. Solomon, III relieved Cmdr. Michael K. Savageaux as CO of the Pittsburgh.

February 26, 2013 The Los Angeles-class attack submarine moved from dry-dock to a pierside location at Naval Submarine Base New London. Completed availability on Aug. 15.

May 12, 2015 USS Pittsburgh returned to Groton after a six-month North Atlantic deployment. She steamed more than 30,000 nautical miles and made port calls to Haakonsvern, Norway; Rota, Spain; and Faslane, Scotland.

November 6, Cmdr. James N. Colston relieved Cmdr. William E. Solomon, III as CO of the SSN 720 during a change-of-command ceremony at the NSB New London.

January 20, 2016 The Pittsburgh departed Naval Submarine Base New London for routine operations.

August 17, USS Pittsburgh departed Groton for a scheduled deployment.

September 27, The Pittsburgh departed Pier 1, Naval Station Rota after a routine port call.

October 12, SSN 720 departed Faslane, Scotland, to participate in a biannual multinational exercise Joint Warrior 16-2.?

December 30, USS Pittsburgh recently moored at Milhaud Pier 5E in Toulon Naval Base, France, for a liberty port visit.

January 1?, 2017 The Los Angeles-class attack submarine moored at West Berth K14, NATO Fuel Depot in Souda Bay, Crete, for a routine port call.

February 17, USS Pittsburgh moored at Pier 8S on Naval Submarine Base New London following a six-month deployment to the U.S. 6th Fleet AoR. The sub traveled 39,000 nautical miles and also made port calls to Haakonsvern, Norway.

April 11, The Pittsburgh entered the floating dry-dock Shippingport (ARDM 4) on Naval Submarine Base New London for a Drydocking Selected Restricted Availability (DSRA).

October 20, USS Pittsburgh moored at Warrior Wharf on Naval Submarine Base Kings Bay, Fla., after recently departed homeport for Tactical Development Exercise (TDE).

November 13, The Pittsburgh recently participated in a Submarine Commander's Course (SCC) at the Atlantic Undersea Test and Evaluation Center (AUTEC) range, off Andros Island, Bahamas.

January 12, 2018 Cmdr. Jason M. Deichler relieved Cmdr. James N. Colston as CO of the Pittsburgh during a change-of-command ceremony at Dealey Center theater on NSB New London.

September 19, The Pittsburgh recently returned to homeport for emergent repairs due to a "minor leak" in its nuclear propulsion plant.

October ?, USS Pittsburgh departed Groton for a scheduled North Atlantic deployment.

December 1, The Pittsburgh moored at Valiant Jetty on Her Majesty's Naval Base (HMNB) Clyde in Faslane, Scotland, for a nine-day port call; Moored at HMNB Clyde again from Jan. 24-2?.

February 6, 2019 SSN 720 moored at Berth 3, Pier 1 on Naval Station Rota, Spain, for a week-long port call.

February 25, USS Pittsburgh moored at Pier 6S on Naval Submarine Base New London after completing its final deployment. The sub traveled approximately 39,000 nautical miles and also made port calls to Haakonsvern, Norway.

May 28, USS Pittsburgh moored at Berth 6, Delta Pier on Naval Base Kitsap-Bremerton, Wash., to commence a year-long inactivation process at the Puget Sound Naval Shipyard, following a month-long transit through the Arctic Ocean.

August 6, The Pittsburgh is inactivated and placed in Reserve (Stand Down) status.

January 17, 2020 USS Pittsburgh held a decommissioning ceremony at the Naval Undersea Museum in Keyport, Wash., after a 34-years of active service.

April 15, USS Pittsburgh was officially decommissioned and stricken from the U.S. Naval Vessel Register.