Stalwart-class ocean surveillance ship
1984 class of American research vessels
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The Stalwart-class auxiliary general ocean surveillance ships (T-AGOS) are a class of United States Naval Ship (USNS) auxiliary support ocean surveillance ships commissioned between April 1984 and October 2000. Their original purpose was to collect underwater acoustical information using the Surveillance Towed Array Sensor System (SURTASS), a towed array passive sonar.
 USNS Stalwart | |
| Class overview | |
|---|---|
| Builders | |
| Operators | |
| Preceded by | None |
| Succeeded by | Victorious class |
| In service | April 12, 1984 |
| Completed | 18 |
| Scrapped | 1 |
| General characteristics | |
| Displacement | 1,565 t.(lt) 2,535 t.(fl) |
| Length | 224 ft (68 m) |
| Beam | 43 ft (13 m) |
| Draft | 15 ft (4.6 m) |
| Propulsion | diesel-electric, two shafts, 1,600 hp (1,200 kW) |
| Speed | 11 knots (20 km/h; 13 mph) |
| Complement | 36 |
Stalwart, Indomitable, and Capable were modified to support narcotics interdiction by removing SURTASS equipment and adding an air-search radar and tactical data link equipment.[1]
Units
| Ship Name | Hull No. | Delivery- Stricken |
Fate | Link |
|---|---|---|---|---|
| Stalwart | 1 | 1984–2002 | 2026 survey ship OCEAN STALWART | NVR NavSource |
| Contender | 2 | 1984–1992 | T/V General Rudder, flagship and training vessel of the Texas A&M University at Galveston | NVR NavSource |
| Vindicator | 3 | 1984–1993 | sold by GSA to private interests in 2023 and pending return to service | NVR NavSource NOAA |
| Triumph | 4 | 1985–1995 | Stricken, to be disposed of in support of Fleet training exercise | NVR NavSource |
| Assurance | 5 | 1985–1995 | Transferred to Portugal as NRP Almirante Gago Coutinho (A523) | NVR NavSource |
| Persistent | 6 | 1985–1995 | T/S State of Michigan, Great Lakes Maritime Academy, Traverse City, Michigan | NVR NavSource NMC |
| Indomitable | 7 | 1985–2002 | now private ocean expedition and dive support vessel DAGON | NVR NavSource NOAA |
| Prevail | 8 | 1986– | Reclassified as Unclassified miscellaneous vessel Prevail (IX-537) | NVR NVR NavSource |
| Assertive | 9 | 1986–2004 | scrapped in 2024 | NVR NavSource |
| Invincible | 10 | 1987–2021 | Converted to T-AGM 24, Missile Range Instrumentation Ship | NVR NavSource MSC |
| Audacious | 11 | 1989–1997 | Transferred to Portugal as NRP Dom Carlos I (A522) | NVR NavSource |
| Vigorous, renamed Bold | 12 | 1989–2004 | today operates as survey vessel Bold Explorer[2] | NVR NavSource EPA |
| Adventurous | 13 | 1988–1992 | NOAA Oscar Elton Sette (R-335) | NVR NavSource NOAA |
| Worthy | 14 | 1988–1993 | Transferred to USGS, then to the US Army. Converted to a Missile Range Instrumentation Ship at Kwajalein Atoll's Ronald Reagan Ballistic Missile Defense Test Site | NVR NavSource KMRSS |
| Titan | 15 | 1989–1993 | today in commercial service as Ocean Titan | NVR NavSource NOAA |
| Capable | 16 | 1989–2004 | NOAA Okeanos Explorer (R-337) | NVR NavSource NOAA |
| Tenacious | 17 | 1987–1997 | Today operates as commercial survey vessel Geo Resolution | NVR NavSource |
| Relentless | 18 | 1990–1993 | NOAA Gordon Gunter (R-336) | NVR NavSource NOAA |