The Virginia class, or the SSN-774 class, is a class of nuclear-powered attack submarine with cruise missile capability in service with the United States Navy. The class is designed for a broad spectrum of open-ocean and littoral missions, including anti-submarine warfare and intelligence gathering operations.[15] They are scheduled to replace older Los Angeles-class attack submarines, many of which have already been decommissioned, as well as four cruise missile submarine variants of the Ohio-class submarines.[13][14] Virginia-class submarines will be acquired through 2043, and are expected to remain in service until at least 2060, with later submarines expected to operate into the 2070s.[16][17] On 14 March 2023, the trilateral Australian-British-American security pact known as AUKUS announced that the Royal Australian Navy would purchase three Virginia-class submarines as a stopgap measure between the retirement of their conventionally powered Collins-class submarines and the acquisition of the future SSN-AUKUS class submarines. If SSN-AUKUS falls behind schedule, Australia will have the option of purchasing two additional Virginia-class submarines.[18][19]