Evidence
6 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-6).
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[1]Dictionary of American Naval Fighting Ships, Vol. V (Navy Department, Office of the Chief of Naval Operations, Naval History Division, 1970), Appendix II - Minecraft 1917-1969, 'YMS-373' ship ledger entry [nhhc_danfs]
- Locator
- Part P, Motor Minesweepers (YMS), Numerical List, entry 'YMS-373'; OCR text via https://archive.org/download/dictionaryofamer05wash/dictionaryofamer05wash_djvu.txt
- Finding type
- vessel_history
- Finding
- YMS-373 was built at Weaver Shipyards, Orange, Tex. Keel laid 12/28/42, launched 1/29/44, completed 4/28/44. Changed from YMS-373 to Jackdaw (AMS-21) on 2/18/47. Changed from AMS-21 to MSC(O)-21 on 2/7/55. Struck 1/1/60. Transferred to Brazil 1/18/63 as Jurva (M-13).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-24
- Study period
- 1942-1963
- Limitations
- Establishes identity, construction, and full redesignation/disposition chronology from the official published DANFS ledger. Contains no asbestos, materials, or condition information of any kind; supports no asbestos claim. The live history.navy.mil DANFS site was returning HTTP 503 for every page requested throughout this session (2026-09-24), so this record cites the official text via its Internet Archive book digitization rather than the live site.
- Atlas source
- true
- Evidence ID
- ev-uss-jackdaw-ams21-01
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[2]Dictionary of American Naval Fighting Ships, Vol. III (Navy Department, Naval History Division, 1968 reprint), alphabetical entry 'Jackdaw' [nhhc_danfs]
- Locator
- Letter 'J' section, p. 482, entry 'Jackdaw'; OCR text via https://archive.org/download/dictionaryofamer03wash/dictionaryofamer03wash_djvu.txt
- Finding type
- vessel_history
- Finding
- 'Jackdaw. A common crow-like bird... YMS-373, commissioned 29 April 1944 (q.v.), was reclassified AMS-21 and given the name Jackdaw 17 February 1947.' (Note: this entry's redesignation date, 17 February, and its commissioning date, 29 April, each differ by one day from the corresponding dates in the Vol. V Appendix II ledger for the same vessel - 18 February and 28 April respectively.)
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-09-24
- Study period
- 1944-1947
- Limitations
- This is the same official publication series as ev-01, not an independent source, so the one-day date conflicts between the two DANFS sections are an internal inconsistency in the official record itself, not corroboration from a second source. No asbestos content; supports no asbestos claim.
- Atlas source
- true
- Evidence ID
- ev-uss-jackdaw-ams21-02
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[3]Dictionary of American Naval Fighting Ships, Vol. V (1970), Appendix II - Minecraft 1917-1969, 'Motor Minesweepers (YMS)' narrative, Class Grouping List, and Class Statistical Summary [nhhc_danfs]
- Locator
- Part P, pp. 497-498; OCR text via https://archive.org/download/dictionaryofamer05wash/dictionaryofamer05wash_djvu.txt
- Finding type
- historical_record
- Finding
- YMS-1-class official statistics: wood-hulled motor minesweepers, 481 hulls built, 'all... had the same general characteristics,' varying only in stack count (YMS-1-134: two stacks; YMS-135-445, 480, 481: one stack; YMS-446-479: none). Length overall 136 ft, extreme beam 24 ft 6 in, full-load displacement 320 tons, max draft 6 ft 1 in, designed accommodations 4 officers/29 enlisted, armament one 3"/50 and two 20mm, designed speed 12 knots, geared diesel engines, designed 1,000 shaft horsepower, 2 propellers. Surviving hulls were reclassified AMS in 1947, redesignated MSC(O) in 1955, then MSCO in 1967.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-24
- Study period
- 1941-1969 (class production and service life); Jackdaw 1944-1963
- Limitations
- Official Navy class-design statistics for all 481 YMS-1-class hulls (Jackdaw falls in the single-stack, YMS-135-481 subgroup). Establishes that this class was wood-hulled and diesel-propelled, with no boilers or steam turbines - materially different exposure profile than the Navy's large steel steam-powered ships. Contains no mention of insulation, gasket, packing, or any other asbestos-relevant material; does not establish presence, absence, quantity, or location of asbestos-containing material of any kind aboard this or any YMS-1-class hull.
- Atlas source
- true
- Evidence ID
- ev-uss-jackdaw-ams21-03
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[4]Corn, Jacqueline Karnell, and Jennifer Starr, 'Historical perspective on asbestos: Policies and protective measures in World War II shipbuilding,' American Journal of Industrial Medicine 11(3):359-373 (1987) [other_primary]
- Locator
- Abstract and article, AJIM 11(3):359-373
- Finding type
- asbestos_application
- Finding
- Peer-reviewed historical study documents that asbestos was used extensively as a fireproofing and insulating material in U.S. shipbuilding during World War II, the era and program under which YMS-373/Jackdaw was built (1942-1944), and that wartime demand drove unprecedented asbestos utilization across the U.S. Navy shipbuilding program generally.
- Verification
- verified
- Role
- context
- Documentation level
- context_only
- Accessed
- 2026-09-24
- Study period
- 1940s era documented; article published 1987
- Population
- WWII U.S. Navy shipyard workers and ship crews (program-wide context)
- Limitations
- Program/era-level scholarly documentation of asbestos use in WWII U.S. Navy shipbuilding generally, reused from ss-john-w-brown.atlas.json (ev-ss-john-w-brown-02) where the same citation appears. Does not name this vessel, its class, or its builder; does not establish that asbestos was, or remains, aboard this hull, nor any quantity, location, condition, exposure, or causation. Wood-hulled, diesel-propelled small combatants were not the shipbuilding-program segment (steel hull, steam propulsion) most commonly discussed in this literature, so this row is kept at context_only rather than upgraded to class_or_era.
- Atlas source
- true
- Evidence ID
- ev-uss-jackdaw-ams21-04
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[5]CourtListener API v4 search (opinions and RECAP full-text), queries logged in search_ledger rows sl-uss-jackdaw-ams21-04 through sl-uss-jackdaw-ams21-07 [court_record]
- Locator
- See search_ledger for exact query strings and result counts
- Finding type
- litigation_documented
- Finding
- No qualifying ship-specific asbestos litigation record was located for this hull under any documented alias (USS Jackdaw, AMS-21, YMS-373, MSC(O)-21, or Jurva/M-13). CourtListener opinion and RECAP full-text searches for 'USS Jackdaw', '"YMS-373"', and 'Jackdaw' + 'minesweeper' returned zero results. A broader RECAP full-text search for 'Jackdaw AMS-21 asbestos' returned three results, all name-collision false positives from unrelated mega-dockets (In re Motors Liquidation Co. (GM), S.D.N.Y. Bankr. No. 09-50026; In re PG&E Corp., N.D. Cal. Bankr. No. 19-30088; In re Commonwealth of Puerto Rico, D.P.R. Bankr. No. 17-03283) with no plausible connection to this vessel; none was opened or reviewed further.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-09-24
- Study period
- 2026-09-24 (search date)
- Limitations
- Absence of a located litigation record does not prove no exposure claim naming this hull has ever been filed or exists in a non-digitized/non-indexed record (e.g., a state-court pleading not on CourtListener, or a claim naming the ship only in an unindexed exhibit). This row records a negative search result, not an affirmative finding that no such claim exists anywhere.
- Atlas source
- true
- Evidence ID
- ev-uss-jackdaw-ams21-05
-
[6]Batch-1710 search ledger (this record): repeated WebFetch and direct-curl attempts against history.navy.mil, 2026-09-24 [other_primary]
- Locator
- search_ledger rows sl-uss-jackdaw-ams21-01 through sl-uss-jackdaw-ams21-03
- Finding type
- historical_record
- Finding
- The live Naval History and Heritage Command website (history.navy.mil), including the online DANFS ship-history pages, returned HTTP 503 Service Unavailable for every page requested during this research session, site-wide (not a single page's link rot). This is a standing access gap for this record, not a one-time failure; the official published DANFS text was instead obtained via its Internet Archive book digitization (see ev-01 through ev-03).
- Verification
- verified
- Role
- archival_lead
- Documentation level
- context_only
- Accessed
- 2026-09-24
- Study period
- 2026-09-24
- Limitations
- Records a source-access problem, not a vessel finding. The live NHHC site (and its Naval Vessel Register detail pages) should be re-checked in a future session; it may hold ship-specific detail (photos, deck logs index, muster data) not present in the printed DANFS text.
- Atlas source
- true
- Evidence ID
- ev-uss-jackdaw-ams21-06