US Navy to start service life-extension program of USS Cheyenne nuclear-powered attack submarine.

According to an article published by the Sea Power magazine website on November 16, 2020. the U.S. Navy USS Cheyenne, a Los Angeles-class nuclear-powered attack submarine (SSN-773) will be the first of the class selected to go through a service life-extension program, citing sources of U.S. Navy.
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Los Angeles-class fast-attack submarine USS Cheyenne (SSN 773) transits in close formation as one of 40 ships and submarines representing 13 international partner nations during Rim of the Pacific 2016. (Picture source U.S. Navy)

Citing Sea Power magazine, the U.S. Navy is planning to refuel six Los Angeles-class SSNs, said Adm. Frank Caldwell, director of the Navy’s Nuclear Power Program, speaking Nov. 16 in a webinar for the annual symposium of the Naval Submarine League.

A total of 62 Los Angeles-class submarines, commonly called 688s, were procured between FY1970 (FY for Fiscal Year) and FY1990 and entered service between 1976 and 1996. They are equipped with four 21-inch diameter torpedo tubes and can carry a total of 26 torpedoes or Tomahawk cruise missiles in their torpedo tubes and internal magazines. The final 31 submarines in the class (SSN-719 and higher) were built with an additional 12 vertical launch system (VLS) tubes in their bows for carrying and launching another 12 Tomahawk cruise missiles.

The final 23 submarines in the class (SSN-751 and higher) incorporate further improvements and are referred to as Improved Los Angeles class boats or 688Is. As of the end of FY2019, 32 of the 62 boats in the class had been retired.

The USS Cheyenne (SSN-773) is the final Los Angeles-class submarine in service with the U.S. Navy. The contract to build her was awarded to Newport News Shipbuilding and Dry Dock Company in Newport News, Virginia on 28 November 1989 and her keel was laid down on 6 July 1992. She was launched on 16 April 1995 and commissioned on 13 September 1996,