The USNS Vindicator (T-AGOS-3) was a Stalwart-class modified tactical auxiliary general ocean surveillance ship constructed for the United States Navy. Laid down on April 14, 1983, by the Tacoma Boatbuilding Company in Tacoma, Washington, she was launched on June 1, 1984, and delivered to the U.S. Navy on November 21, 1984. Designed primarily for Cold War anti-submarine warfare support, Vindicator was equipped with Surveillance Towed Array Sensor System (SURTASS) sonar gear to detect Soviet submarines. She was placed in non-commissioned service under the Military Sealift Command upon delivery. Throughout her naval service, Vindicator played a crucial role in underwater acoustical data collection, supporting Cold War operations. After the Cold War's end, she was decommissioned from Navy service on June 30, 1993, and leased to the U.S. Coast Guard, where she was commissioned as USCGC Vindicator (WMEC-3) in May 1994. As a medium endurance cutter based in Norfolk, Virginia, she served primarily in counternarcotics operations and participated in efforts such as Operation Able Manner. However, her inability to carry helicopters and her limited top speed led to her decommissioning again in May 2001. In October 2001, Vindicator was transferred to NOAA, undergoing a $4 million conversion into an oceanographic research vessel. Renamed NOAAS Hiʻialakai (R 334), she was commissioned into NOAA service in September 2004. Among her scientific capabilities were multibeam sonar, echosounders, and extensive facilities for diving operations, including multiple small boats, laboratories, and a decompression chamber. Her mission involved mapping coral reefs, conducting bio-assessments, and supporting marine research around the Hawaiian Islands and the Pacific, notably in the Papahanaumokuakea Marine National Monument. Hiʻialakai’s notable discoveries included the wreck of the 19th-century whaling ship Two Brothers in French Frigate Shoals. Her longest mission was a 103-day coral reef assessment in American Samoa in 2015. Due to extensive corrosion, NOAA retired her in December 2020, marking the end of her versatile service spanning military, coast guard, and scientific roles.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.