Evidence
7 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-7).
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[1]DANFS, Implicit II (AM-455), NHHC (published 2015-07-21; live page returns 404 - Wayback capture 2024-05-03 cited; verbatim mirror at hazegray.org/danfs/mine/am455.htm via Wayback 2024-12-28) [nhhc_danfs]
- Locator
- DANFS entry 'Implicit II (AM-455)', specifications block + service narrative
- Finding type
- vessel_history
- Finding
- DANFS record for this hull: launched by Wilmington Boat Works, Wilmington, Calif., 1 August 1953; sponsored by Mrs. Landon Horton; commissioned 10 March 1954, Lt. Comdr. A. C. Filiatrault in command. Specifications block: dp 630; l. 172'; b. 36'; dr. 10'; s. 16 k.; cpl. 72; a. 1 40mm.; cl. Agile. 'One of a class of new minesweepers constructed entirely of nonmagnetic materials.' Home port Long Beach; Seventh Fleet deployments 1957-58, 1960; U.S.-Canadian minesweeping exercises off British Columbia 1961; South Vietnam advisory deployment Jan-Aug 1962; Formosa operations 1964 followed by Long Beach yard overhaul; Mine Division 91 'Market Time' patrols 1965-66 (fired on by Vietcong; ~700 rounds of 40mm supporting SVN craft 22-23 March; 1,000+ junks/sampans boarded); Operations 'Eager Angler' and 'COMPTUEX' late 1966; narrative ends 'into 1967.'
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 1953-1967 (DANFS narrative coverage)
- Population
- Wilmington Boat Works construction trades 1952-53; commissioning and operational crews (design complement 72)
- Limitations
- DANFS documents service history and specifications, not materials or asbestos content. Narrative coverage ends in 1967; post-1967 service (through 1994) is outside this source. 'Yard overhaul' at Long Beach 1964 does not name the yard. Live NHHC page 404s - archived capture cited.
- Atlas source
- true
- Evidence ID
- ev-uss-implicit-am455-01
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[2]Naval Vessel Register ship detail, IMPLICIT (MSO 455), ex-AM 455, MINESWEEPER,OCEAN; UIC 07985 (live page redirects to NVR home after stricken-ship removal - Wayback capture 2024-09-09 cited) [other_primary]
- Locator
- NVR ship detail page, Vessel Status + Milestone Dates + Program Characteristics blocks
- Finding type
- vessel_history
- Finding
- NVR record for this hull: class MSO 422; propulsion type Diesel; commission 03/10/1954; launch 08/01/1953; decommission 09/30/1994; stricken 11/29/1994; status 'Disposed of through the Security Assistance Program (SAP), transferred, cash sale, ex-US fleet hull foreign military sale case number assigned'; custodian TAIWAN; page last updated 06/29/2000.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 1954-1994 (USN); record last updated 2000
- Population
- Crew at decommissioning; FMS/SAP transfer personnel
- Limitations
- NVR documents register status, propulsion type, and disposition - not materials or asbestos content. Stricken date 11/29/1994 conflicts with NavSource/Wikipedia's 20 November; NVR carried. Decommissioning location (Tacoma, WA) appears only in secondary sources.
- Atlas source
- true
- Evidence ID
- ev-uss-implicit-am455-02
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[3]FAS Military Analysis Network, MSO-422 Aggressive-class page (class specifications republished from U.S. Navy fact-file data) + NVR propulsion entry for this hull [other_primary]
- Locator
- FAS MSO-422 class page, Specifications block; NVR ship detail propulsion line
- Finding type
- asbestos_application
- Finding
- Class/era inference for a 1952-54 wooden-hulled, nonmagnetic-construction ocean minesweeper with a diesel plant (NVR: 'Diesel'; class data: 4 aluminum-block diesels, 2 shafts): era-standard asbestos applications on a ship of this configuration center on machinery exhaust lagging, engine gaskets and packing, electrical insulation, floor/deck coverings, and small auxiliary machinery - not boiler or steam-line lagging, as the type carried no steam plant. Built in the period when asbestos-containing materials were standard in U.S. naval construction.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-09-22
- Study period
- 1952-1994
- Population
- Construction trades 1952-53; crew 1954-1994 (design complement 72)
- Limitations
- Class/era inference only - no ship-specific material specification, survey, or installation record for this hull is cited or located. Asbestos presence aboard this hull is plausible era inference, not ship-proven; no quantity, location, or product is established. FAS is a secondary republisher of Navy data, used here for class-level power-plant configuration only.
- Atlas source
- true
- Evidence ID
- ev-uss-implicit-am455-03
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[4]Stocktonia News (2025-12-29, C. Woodyard); Taiwan News (2025-05-04, 2025-06) on ROCS Yung Yang retirement; Fox40 Sacramento and Local News Matters (2026-01-02) corroborating [reputable_press]
- Locator
- stocktonia.org 2025-12-29 article; taiwannews.com.tw/news/6144514 and /news/6101472; fox40.com 2026 Lucid restoration piece
- Finding type
- vessel_history
- Finding
- Post-USN disposition record for this hull: ROC Navy service as Yung Yang (MSO-1306) ended with decommissioning 1 July 2025 ('72 years of service,' replaced under a drone-ship modernization program, per Taiwan News); scrapped at Kaohsiung in 2026. Before breaking, ~10 Stockton Maritime Museum volunteers removed roughly 50 tons of parts (~40 shipping containers, incl. anchor/chain and propeller-pitch console) for sister ship USS Lucid (MSO-458), the last surviving class unit in the U.S.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 1994-2026
- Population
- ROC Navy crew 1995-2025; Kaohsiung scrapping workers; museum salvage volunteers
- Limitations
- Press sources, not official records; consistent across three outlets but ROC Navy documentation not located. Taiwan News's May 2025 piece mislabels the ship as ex-USS Persistent - an error not carried (NVR and Navypedia confirm ex-Implicit). Asbestos handling during salvage/scrapping is undocumented; a salvage/breaking event on an elderly hull is a disturbance event, not an ACM finding.
- Atlas source
- true
- Evidence ID
- ev-uss-implicit-am455-04
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[5]Navypedia, 'YUNG YANG ocean minesweepers (1954-1956/1995)' - Taiwan service entry for ex-Implicit (1306) and sisters [other_primary]
- Locator
- Navypedia Yung Yang class table + notes paragraph
- Finding type
- historical_record
- Finding
- Secondary compilation record: the four ex-USN MSOs transferred to Taiwan (incl. ex-Implicit as Yung Yang 1306) 'had outer hull planking replaced prior to delivery in Taiwan; they were formally commissioned at Kaohsiung in 1995' (Yung Yang commissioning 1 March 1995). Documents a material-change event - wooden hull re-planking - on this hull between U.S. disposal (1994-09-30) and ROCN commissioning.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 1994-1995
- Population
- Taiwanese dockyard workers (pre-delivery refit, 1994-95)
- Limitations
- Navypedia is a secondary compilation, not a primary source - the re-planking claim is unverified against Taiwanese dockyard records. Documents hull work, not asbestos; no ACM information. ROCN commissioning date (1 Mar 1995) explains press statements that the ship 'joined' Taiwan's Navy in 1995 vs. the 1994 U.S. disposal date.
- Atlas source
- true
- Evidence ID
- ev-uss-implicit-am455-05
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[6]NavSource Online Mine Warfare Vessel Photo Archive, MSO-455 Implicit (photo archive, CO list, Bureau of Ships trial photo 1954-01-16); NARA RG 24 deck logs and RG 19/BuShips records as undigitized hull-level leads [other_primary]
- Locator
- navsource.net/archives/11/02455.htm; catalog.archives.gov id 6477973 (1991 photo)
- Finding type
- historical_record
- Finding
- Archival leads for hull-level detail not yet retrieved: NavSource photo/commanding-officer archive for MSO-455 (laid down 29 Oct 1952, reclassified MSO-455 7 Feb 1955 - dates carried in the record on this source); NARA RG 24 deck logs and RG 19 Bureau of Ships records (per-vessel material/specification files) are the standard repositories for hull-level construction detail; a DoD still image of MSO-455 is cataloged at catalog.archives.gov id 6477973.
- Verification
- unverified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 1952-1994
- Limitations
- Leads only - NARA deck logs and BuShips files were not retrieved (catalog search interface is script-driven; no deck-log scan located online). NavSource is a volunteer archive: dates carried from it are corroborated by navysite/globalsecurity but not by an official record for the laid-down and reclassification dates.
- Atlas source
- true
- Evidence ID
- ev-uss-implicit-am455-06
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[7]Batch-1366 search ledger (this record): NHHC DANFS (Wayback), NVR (Wayback), NavSource, Navypedia, FAS class page, Taiwan News/Stocktonia/Fox40 disposition press, CourtListener API v4, NARA catalog, shipyards.json check [other_primary]
- Locator
- search_ledger rows sl-uss-implicit-am455-01 through sl-uss-implicit-am455-09
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, museum condition report, or confirmable docketed case naming AM-455/MSO-455 was found in the public sources searched (see search_ledger). CourtListener ship-name queries ('USS Implicit', 'MSO-455', 'AM-455') were blocked by an exhausted shared API quota (HTTP 429, 2800/day) at query time - the litigation check is incomplete, not a confirmed negative.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-09-22
- Study period
- 2026-09-22
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - 1950s-era construction makes some ACM plausible. Conversely the diesel, wooden-hulled configuration carried far less lagging surface than steam hulls. Litigation status is unresolved pending a CourtListener re-run; web-level litigation searching surfaced only non-authoritative marketing pages (excluded per source rules).
- Atlas source
- true
- Evidence ID
- ev-uss-implicit-am455-07