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1 1 (June 1, 2021)

handle is hein.crs/govedmc0001 and id is 1 raw text is: Congressional Research $endce Irdo~ ming We Ie~i~Iaflv~ debate since fliA UpdatedJune 1,2021 Navy TAGOS(X) Ocean Surveillance Shipbuilding Program: Background and Issues for Congress Introduction The Navy wants to procure in FY2022 the first of a planned new class of seven TAGOS(X) ocean surveillance ships. The Navy's proposed FY2022 budget requests $434.4 million for the procurement of the first TAGOS(X). The is sue for Congress is whether to approve, reject, or modify the Navy's funding requests and acquisition strategy for the program. TAGOS Ships in the Navy TAGOS ships (Figure 1 and Figure 2) support Navy antisubmarine warfare (ASW) operations. As stated in the Navy's FY2021 budget submis sion, TAGOS ships use the Surveillance Towed-Array Sensor System(SURTASS) to gather undersea acoustic data. They also carry electronic equipment to process and transmit that data via satellite to shore stations for evaluation. Figure 3 shows a simplified diagramof a TAGOS(X) ship with its SURTASS arrays trailing below and behind the ship. In the designation TAGOS (also written as T-AGOS), the T means they are operated by the Military Sealift Command (MSC); the A means they are auxiliary (i.e., support) ships; the G means theyhave a generalormiscellaneous mission; and the OS means the missionis ocean surveillance. In the programdesignationTAGOS(X), the X means that the new TAGOS ship's precise designhas not yetbeendetermined. service in 2000. As of the end of FY2020, all five were homeported at Yokohama, Japan. The five in-service TAGOS ships are Small Waterplane Area Twin Hull (SWATH) ships. In a SWATH ship, the upperpart of the ship sits on top of two struts that extend down to a pair of submerged hulls that looklike submarine hulls (Figure 2). The struts have a narrow cross section at the waterline (i.e., they have a small waterplane area). The SWATH designhas certain limitations, but has features (including very good stability in high seas) that are useful for SURTASS operations. Figure 2. USNS Effective (TAGOS-2 I) in Dry Dock ~. i > & Figure 1. USNS Impeccable (TAGOS-23) Source: U.S. Navy photograph 070913-N-2638R-004 posted at Wikimedia Commons, accessed May 25,2021. Figure 3. TAGOS(X) Ship with SURTASS Arrays Source: U.S. Navy photograph accompanyingOcean Surveillance Ships, Military Sealift Command, accessed May 25,2021. Current TAGOS Ships The Navy currently operates five aging TAGOS ships- four Victorious (TACOS-19) class ships (TACOS 19 through 22) that entered service between 1991 and 1993, and one Impeccable (TACOS-23) class ship that entered Source: Detailfrom briefing slide entitled TAGOS(X) Concept of Operations (CONOPS), slide 13 in Industry Day briefingfor TAGOS(X) program,June26,2019,accessed May26,2021,at GovTribe.com. https://crs reports.congress.gov

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