USS Pittsburgh (SSN-720) is a and is the fourth ship of the United States Navy to be named for Pittsburgh, Pennsylvania.
History
The contract to build Pittsburgh was awarded to the Electric Boat Division of General Dynamics Corporation in Groton, Connecticut, on 16 April 1979, and her keel was laid down on 15 April 1983. She was launched on 8 December 1984 and commissioned on 23 November 1985.
On 2 April 1991 Pittsburgh and conducted submarine-launched Tomahawk missile attacks against Iraq during Operation Desert Storm.
Pittsburgh departed in October 2002 for a deployment to the Mediterranean Sea. There, she again fired Tomahawk missiles into Iraq during Operation Iraqi Freedom. She returned on 27 April 2003.
On 25 February 2019, Pittsburgh returned to her homeport at Naval Submarine Base New London after completion of her final deployment. The submarine then arrived at Bremerton, Washington on 28 May 2019, for a months-long inactivation and decommissioning process.
thumb|left|USS Pittsburgh demonstrates an emergency main ballast tank blow in 1991.
Pittsburgh was officially deactivated on 17 January 2020 at the Undersea Warfare Museum in Keyport, Washington, and awaited the Submarine Recycling Program at Puget Sound Naval Shipyard in Bremerton, Washington. She was later decommissioned on 15 April 2020 and the crew released, exactly 37 years after her keel was laid down.