The US Navy (USN) is moving forward with plans to recapitalise its fleet of ocean surveillance ships (T-AGOS) with a new class of large Small Waterplane Area Twin Hull (SWATH) vessels.
Designed to gather underwater acoustical data over a wide area using Surveillance Towed-Array Sensor System (SURTASS), five T-AGOS ships are operated by Military Sealift Command to support the anti-submarine warfare mission of the Atlantic and Pacific fleets. An initial four Victorious-class vessels (T-AGOS 19) were commissioned between September 1991 and July 1993.
A fifth ship, USNS Impeccable (T-AGOS 23), was commissioned in 2001. This vessel adopts the same SWATH hullform but is longer and configured with a more powerful propulsion plant.
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