Stalwart-class ocean surveillance ship

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.

Stalwart class

USNS Stalwart
Class overview
Builders	1–12: Tacoma Boatbuilding Company, Tacoma, Washington 13–18: VT Halter Marine, Inc., Moss Point, Mississippi
Operators	United States Navy  Portugal  New Zealand
Preceded by	None
Succeeded by	Victorious class
In service	April 12, 1984
Completed	23
Active	5 not stricken by Naval Vessel Register
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	State University of New York Maritime College	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	NOAA Hi'Ialakai (R-334)	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	NOAA McArthur II (R-330)	NVR NavSource NOAA
Prevail	8	1986–	Reclassified as Unclassified miscellaneous vessel Prevail (IX-537)	NVR NVR NavSource
Assertive	9	1986–2004	Transferred to NOAA to be converted FY 2007 and to replace NOAA David Starr Jordan. Damaged during a fire at NOAA's pier in Seattle Washington July 2006, transferred to Seattle Maritime Academy. (R 444) in FY 2008	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	EPA Bold (OSV-224) until ~2013. Converted to R/V Bold Explorer, EGS Group, 2020.[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	NOAA Ka'Imimoana (R-333) until June 18, 2014; Research/Survey Vessel Ocean Titan IMO: 8835231 survey vessel own by Stabbert Maritime	NVR NavSource NOAA
Capable	16	1989–2004	NOAA Okeanos Explorer (R-337)	NVR NavSource NOAA
Tenacious	17	1987–1997	Transferred to New Zealand as HMNZS Resolution (A14) (1997-2012), then sold into civilian service to EGS Group and renamed RV Geo Resolution	NVR NavSource
Relentless	18	1990–1993	NOAA Gordon Gunter (R-336)	NVR NavSource NOAA