Evidence
8 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-8).
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[1]research packet 961-packet.md (1 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERDICT: MISMATCH (real identity: USS YMS-450)
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Evidence ID
- uss-yms-450-pkt-961-packet-md
-
[2]NavSource Online, Patrol Craft Sweeper Photo Archive, PCS-1399 / ex-YMS-450 [museum_official]
- Locator
- Timeline and specifications sections
- Finding type
- vessel_history
- Finding
- The live NavSource PCS-1399 page identifies this hull as ex-YMS-450, records the South Coast Co. build at Newport Beach, the 1943-08-07 keel date, 1944-04-15 launch, 1948-01-22 transfer to the Philippines as Tarlac (P 11), and 1969 scrapping. It also publishes the hull-specific dimensions, complement, armament, and diesel propulsion figures used in this record.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1969
- Limitations
- NavSource is a naval-history photo archive rather than a DANFS/NARA record; the page itself says no DANFS history is available for PCS-1399. It supports the published construction/specification/disposition facts but does not establish asbestos content, quantity, condition, exposure, or causation.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-450-01
-
[3]NavSource Online, PCS-1399 / ex-YMS-450 page; current batch re-scope from Trill fact-QA (2026-09-29) [museum_official]
- Locator
- NavSource timeline bullets; batch scope instruction
- Finding type
- historical_record
- Finding
- Designation sequence requires a correction to the legacy public framing: the current canonical scope is YMS-450, laid down as PCS-1399 and redesignated YMS-450 on 1943-09-27 before completion; PCS-1399 was never a served designation for this hull. The live NavSource page instead says YMS-450 was reclassified back to PCS-1399 on 1944-06-23 and commissioned as PCS-1399 on 1944-11-25. That conflicting account is retained as a discrepancy, not merged into the canonical identity.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1944
- Limitations
- The public NavSource page documents the conflict but cannot independently prove the corrected 1943-09-27 sequence. The corrected sequence is the batch's canonical fact-QA instruction; an underlying primary Navy redesignation document was not located in this pass.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-450-02
-
[4]National Archives, Special List #44, by Ship Numbers [other_primary]
- Locator
- PDF pp. 115-121, YMS entries; no YMS-450 entry located
- Finding type
- historical_record
- Finding
- NARA's Special List #44, by Ship Numbers, is an official index to Navy deck-log holdings. It contains many YMS entries but no YMS-450 line. This is an archival coverage result, not evidence that the vessel had no deck logs or no service.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-1947 holdings index
- Limitations
- Absence from this finding aid does not establish absence of logs, service, asbestos, exposure, or causation. It only records that YMS-450 was not located in this digitized list.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-450-03
-
[5]National Archives, Researching Asbestos aboard US Naval Vessel up through 1961 [other_primary]
- Locator
- Beginning Research; Hull Series and S-code discussion
- Finding type
- asbestos_application
- Finding
- NARA's research guide for asbestos aboard U.S. naval vessels identifies ship-specific engineering drawings and related Navy records, including S39 insulation and lagging and S48 piping, as research paths. It expressly cautions that the listed general record series do not themselves provide direct evidence of asbestos in a particular ship or component.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1941-1961
- Population
- U.S. naval vessels through 1961
- Limitations
- This is a research-method and archival-context source, not a finding that YMS-450 contained asbestos. No S39/S48 drawing or hull-specific material schedule was retrieved; no product, quantity, condition, exposure, or causation is established.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-450-04
-
[6]U.S. General Accounting Office, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 [gao]
- Locator
- Highlights and full-report description
- Finding type
- asbestos_application
- Finding
- GAO's Navy-wide HRD-80-2 review documents Navy use and management of asbestos insulation in ships and shipyards, including a policy of replacing damaged or removed insulation with non-asbestos material in specified circumstances. The report is program-level context and does not name YMS-450 or the PCS/YMS hull class.
- Verification
- verified
- Role
- context
- Documentation level
- context_only
- Accessed
- 2026-10-04
- Study period
- 1975-1979 review
- Population
- Navy ships and shipyards reviewed by GAO
- Limitations
- Navy-wide ship/shipyard context only; it does not establish asbestos aboard this hull, in a YMS/PCS vessel, or for any person, and does not establish quantity, location, condition, exposure, or causation.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-450-05
-
[7]Batch-8317 source sweep: NavSource hull page; NARA asbestos guide and deck-log finding aid; GAO HRD-80-2; CourtListener sweep was incomplete and is separately logged [other_primary]
- Locator
- Search ledger sl-uss-yms-450-01 through sl-uss-yms-450-08
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record was located in the official/authoritative sources searched for this pass: no hull survey, abatement contract, hazmat disclosure, asbestos material schedule, or direct Navy/NARA finding naming YMS-450 or PCS-1399. The absence is recorded as a negative finding, not as proof that asbestos was absent.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04 research pass
- Limitations
- A public-record negative does not prove absence of asbestos aboard. CourtListener could not be completed because the authenticated fleet limiter stood down after the first attempted query; litigation is therefore not a completed negative finding.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-450-06
-
[8]Authenticated CourtListener helper, cl-auth-search.py; four-query protocol [other_primary]
- Locator
- Helper stderr: fleet-wide pacing budget momentarily spent; no HTTP result returned
- Finding type
- historical_record
- Finding
- The authenticated CourtListener helper was invoked for the exact-name opinion query "USS YMS-450" but the fleet-wide pacing limiter reported that the request budget was momentarily spent before the request completed. No result set was received. The remaining three required base queries were not attempted after the helper's stand-down instruction.
- Verification
- partial
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04
- Population
- CourtListener opinions and dockets
- Limitations
- This is a process-status finding, not a no-litigation result. Do not infer that the vessel was absent from CourtListener. No asbestos-qualified variants were run because the four base queries were not completed and the limiter required stand-down.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-450-07