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.

March 21, 2003 Thirty U.S. Navy and coalition warships, including USS Pittsburgh, currently assigned to Naval Forces Central Command launched Tomahawk Land Attack Missiles (TLAMs) during military operations to disarm Iraq.

April 27, SSN 720 returned from a seven-month deployment in support of Operation Iraqi Freedom. The sub departed in October 2002 for a regular scheduled deployment in the Mediterranean Sea with the USS Harry S. Truman (CVN 75) BG.

September 19, Cmdr. David J. Hahn relieved Cmdr. Jeffrey S. Currer as CO of USS Pittsburgh during a change of command ceremony held onboard the sub in Naval Submarine Base New London, Groton, Conn.

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 approximately 16 months of engineered overhaul availability period.

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.

June 19, Cmdr. Michael K. Savageaux relieved Cmdr. Andrew C. Jarrett, as commanding officer 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 Area of Responsibility (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.