SSBN 743 is the 18th and last ship of the United States Navy's Ohio-class of nuclear-powered fleet ballistic missile submarines.

The contract to build the Louisiana was awarded on December 19, 1990, and her keel was laid down at the Electric Boat Division of General Dynamics in Groton, Conn., on October 23, 1992.

July 27, 1996 PCU Louisiana, the 10th Trident II (D5) submarine, was christened during a ceremony at Electric Boat Division of General Dynamics, Groton, CT. The ship's sponsor was Mrs. Patricia O'Keefe.

August 14, 1997 SSBN 743 was delivered to the Navy during a ceremony at Electric Boat Division of General Dynamics in Groton.

September 6, USS Louisiana was commissioned during a ceremony at the Trident Naval Base at Kings Bay, Ga.

December 18, The Louisiana Blue Crew successfully launched one Trident II missile during the ship's Demonstration and Shakedown Operation.

October 15, 1998 SSBN 743 completed its strategic loadout at Strategic Weapons Facility, Atlantic, Kings Bay, Ga., and deployed.

May ?, 1999 USS Louisiana (Gold) returned home after completing its 3rd, two-month, strategic deterrent patrol.

August ?, Cmdr. Davig G. Ruff relieved Cmdr. William R. Borger as CO of the Gold Crew.

December 12, The Ohio-class ballistic missile submarine pulled into Souda Bay, Greece, for a four-day port call.

January ?, 2000 USS Louisiana (Gold) returned to Kings Bay after completing its 5th, three-month, strategic deterrent patrol.

March 17, The Louisiana arrived in Halifax, Nova Scotia, for a scheduled port visit.

April 28, USS Louisiana (Blue) returned to Kings Bay after completing its 6th, two-and-a-half month, strategic deterrent patrol.

May 26, Cmdr. Michael W. Byman relieved Cmdr. John E. Bruns as CO of the SSBN 743 (Blue).

August 23, USS Louisiana (Gold) returned to homeport after completing its 7th strategic deterrent patrol.

December 6, USS Louisiana (Blue) returned to NSB Kings Bay after more than a two-month strategic deterrent patrol.

March ?, 2001 USS Louisiana (Gold) returned home after completing its 9th strategic deterrent patrol.

June 25, SSBN 743 (Blue) successfully launched three Trident II missiles during a Follow-on CINC Evaluation Test.

November ?, USS Louisiana (Gold) returned to Kings Bay after completing its 11th strategic deterrent patrol.

April 24-25, 2002 The 18th Ohio-class ballistic missile submarines successfully launched three D5 missiles during two Follow-on CINC Evaluation Tests.

June ?, USS Louisiana (Gold) returned to Kings Bay, Ga., after more than a two-month strategic deterrent patrol.

January 20, 2003 USS Louisiana (Gold) returned to Naval Submarine Base Kings Bay after completing its 15th strategic deterrent patrol.

July 28, SSBN 743 (Gold) departed homeport for its 17th strategic deterrent patrol.

April 15, 2004 USS Louisiana (Gold) returned to Kings Bay after completing its 19th, 10-week, strategic deterrent patrol.

May 7, Cmdr. Peter H. Hanlon relieved Cmdr. William A. Ebbs as commanding officer of the Gold Crew.

December 20, USS Louisiana (Gold) returned to homeport after more than a three-month strategic deterrent patrol.

October 12, 2005 USS Louisiana arrived at its new homeport of Naval Base Kitsap-Bangor, Wash.

February 10, 2006 Cmdr. Blake L. Converse relieved Cmdr. John K. McDowell as CO of the Louisiana (Blue) during a change-of-command ceremony at the Naval Undersea Museum in Keyport, Wash.

February 25, 2011 USS Louisiana (Gold) returned to Bangor after a 85-day strategic deterrent patrol.

September 6, Cmdr. Paul L. Varnadore relieved Cmdr. Eric P. Woelper as CO of the Louisiana (Blue) during a change-of-command ceremony at Naval Base Kitsap-Bangor's Deterrent Park. Woelper, who assumed command of the Blue Crew in February 2009, completed four strategic deterrent patrols during his time aboard Louisiana.

February 23, 2012 USS Louisiana (Gold) returned to homeport after completing a strategic deterrent patrol.

March 16, Cmdr. Robert E. Peters relieved Cmdr. Joseph M. Turk as CO of the SSBN 743 (Gold) during a change-of-command ceremony at the Naval Undersea Museum in Keyport, Wash.

May 6, USS Louisiana (Blue) returned to Naval Base Kitsap-Bangor after a 55-day strategic deterrent patrol.

August 20, USS Louisiana (Gold) returned to Bangor, Wash., after a 73-day strategic deterrent patrol.

April 5, 2013 SSBN 743 (Gold) returned to Bangor after a three-month strategic deterrent patrol.

July 26, USS Louisiana (Blue) returned to homeport following a strategic deterrent patrol.

December 13, USS Louisiana (Gold) returned to Naval Base Kitsap-Bangor following strategic deterrent patrol.

April 22, 2014 USS Louisiana (Blue) returned to Bangor after completing a strategic deterrent patrol.

August 15, Cmdr. Melvyn N. Naidas relieved Cmdr. Robert E. Peters as CO of the Louisiana (Gold) during a change-of-command ceremony at the Naval Undersea Museum.

December 18, SSBN 743 (Blue) returned to homeport after completing a strategic deterrent patrol.

March 4, 2016 USS Louisiana (Gold) returned to Bangor following a strategic deterrent patrol.

June 9, USS Louisiana (Blue) returned to Naval Base Kitsap-Bangor following a strategic deterrent patrol.

August 18, USS Louisiana (Gold) collided around 6 p.m. with the offshore support vessel USNS Eagleview (T-AGSE 3), while transiting the Strait of Juan de Fuca. The sub returned to Bangor safely for damage assessment.

December 9, Cmdr. Chimi I. Zacot relieved Cmdr. Michael J. Daigle, Jr., as CO of the USS Louisiana (Blue) during a change-of-command ceremony at the Naval Base Kitsap-Bangor chapel.

May 22, 2017 USS Louisiana (Gold) returned to Naval Base Kitsap-Bangor following a strategic deterrent patrol.

June 9, Cmdr. Martin E. Sprague, II relieved Cmdr. Melvyn N. Naidas as CO of the Louisiana (Gold) during a change-of-command ceremony at the Naval Undersea Museum.

October 15, USS Louisiana (Blue) returned to Bangor after completing a strategic deterrent patrol.

March 2, 2018 USS Louisiana (Gold) moored at Delta Pier South on Naval Base Kitsap-Bangor following a strategic deterrent patrol.

May 3, USS Louisiana (Blue) moored at Delta Pier South on Naval Base Kitsap-Bangor following a strategic deterrent patrol.

June 27, 2019 Cmdr. Martin E. Sprague, II relieved Cmdr. Chimi I. Zacot as CO of the Louisiana (Green) during a crew combination ceremony at the Naval Undersea Museum.

September 11, SSBN 743 entered the Dry Dock #4 at the Puget Sound Naval Shipyard in Bremerton for a Engineered Refueling Overhaul (ERO).

March 6, 2020 Cmdr. Lester O. Patterson, Jr., relieved Cmdr. Martin E. Sprague, II as CO of the Louisiana (Green) during a change-of-command ceremony at the Naval Base Kitsap-Bangor chapel.

March 25, 2022 Cmdr. Michael A. Kessler relieved Cmdr. Lester O. Patterson, Jr., as CO of the Louisiana (Green) during a change-of-command ceremony at the Naval Undersea Museum.

August 5, Cmdr. Michael A. Kessler assumed command of the USS Louisiana (Blue Crew) while Cmdr. Joslyn M. Veney assumed command of the Gold Crew during a crew split and an assumption of command ceremony at Pier 3 on Puget Sound Naval Shipyard.

February 9, 2023 USS Louisiana departed Puget Sound Naval Shipyard for sea trials following a three-and-a-half year overhaul; Brief stop off Naval Base Kitsap-Bangor on Feb. 17; Returned home on Feb. 18; Underway again on Feb. ?; Brief stop in the Strait of Juan de Fuca on March 1.

September 23, USS Louisiana made a brief stop at N/S/O Mike Pier on Naval Base Point Loma in San Diego; Brief stop off Point Loma on Sept. 25; Brief stop off Point Loma again on late Monday evening; Brief stop off Point Loma to embark the VIP guests on Sept. 27.

September 27, The Louisiana (Blue) launched an unarmed Trident II D5LE missile, at approx. 2.10 p.m. PDT, during a Demonstration and Shakedown Operation (DASO) 32 at the Point Mugu Test Range; Brief stop off Naval Base Point Loma to disembark the VIP guests on Sept. 28.

May 29, 2024 USS Louisiana (Gold) moored at Bravo Wharf in Apra Harbor, Guam, for a six-day port call to conduct crew exchange; Conducted a vertical replenishment-at-sea with the USNS Cesar Chavez (T-AKE 14), while underway off the west coast of Guam, on June 28.

July 24, The Louisiana made a brief stop off Naval Base Point Loma for personnel transfer; Brief stop off Point Loma again on Aug. 2 and 7th.

September 3, USS Louisiana moored at Delta Pier on Naval Base Kitsap-Bangor following a four-month strategic deterrent patrol.

September 12, Cmdr. Noah L. McBurnett relieved Cmdr. Michael A. Kessler as CO of the Louisiana (Blue) during a change-of-command ceremony at the Naval Undersea Museum.