Evidence
9 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-9).
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[1]research packet 963-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: USS PCS-1411 → **MISMATCH (RE-SCOPE signal: real identity YMS-458)
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Evidence ID
- uss-yms-458-pkt-963-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-458 (ex-PCS-1411) - milestone timeline, specifications, commanding officer, post-Navy merchant registrations [other_primary]
- Locator
- NavSource 11/19458.htm vessel-history block and specifications block
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: 'Laid down 3 December 1943 as Patrol Craft Sweeper, PCS-1411 by the Greenport Basin and Construction Co., Greenport, NY'; 'Reclassified as an Auxiliary Motor Minesweeper, YMS-458, 26 September 1943'; launched 12 February 1944; completed 9 October 1944; 'Commissioned 10 October 1944 under the command of LTJG Albert B. Holland, USNR'; decommissioned 1 December 1946; struck from the Naval Register 25 February 1947; transferred to the War Shipping Administration 26 September 1947; registered 1948 to Elmer C. Jakeway, Jr., of Ketchikan, AK as the freighter El Clare; registered 1956 to the Brunswick Navigation Co. of Southport, NC as the fishing boat John M. Morehead out of Wilmington, NC; acquired 1967 by Standard Products, Inc. of Kilmarnock, VA for use as a fishing boat; abandoned in 1978. Spec block: displacement 270 t., length 136 ft, beam 24 ft 6 in, draft 8 ft, speed 15 kts, complement 32; armament one 3"/50 dual-purpose mount, two 20mm mounts, two depth-charge projectors; propulsion two General Motors 8-268A diesel engines, Snow and Knobstedt single-reduction gear, two shafts. Page classifies the hull as 'PCS-1376 Class Patrol Craft Sweeper/YMS-1 Class Auxiliary Motor Minesweeper.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1978
- Population
- Greenport Basin construction trades (1943-44); USN crew ~32 (1944-46); merchant crews (1948-78)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - but it is the most complete located milestone record for this unnamed numbered hull. Its own text is internally inconsistent on the reclassification ('Laid down ... as PCS-1411' on 3 Dec 1943 vs reclassification to YMS-458 listed 26 Sep 1943, before keel-laying; see gaps). Contains no asbestos or material content. 'Abandoned in 1978' conflicts with Colton's 'scrapped 1978' (see gaps). The only photograph on the page depicts sister YMS-404, not this hull.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-458-01
-
[3]Navy and Marine Corps Awards Manual - 1953, Part IV, Section 17: list of ships credited by the Secretary of the Navy as qualified for the Navy Occupation Service Medal (verbatim transcription on HyperWar/ibiblio) [other_primary]
- Locator
- Awards Manual Part IV Section 17, unit-eligibility table, row 'YMS 458 | 14 Sep 45 - 15 Feb 46 | A'
- Finding type
- vessel_history
- Finding
- The official 1953 awards manual lists 'YMS 458' with a Navy Occupation Service Medal qualifying period of 14 September 1945 - 15 February 1946, clasp A (Asia) - placing this hull on occupation/minesweeping duty in Japanese waters under the post-surrender Pacific minesweeping operations for most of her commissioned life after commissioning in October 1944.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-09-14 to 1946-02-15
- Population
- YMS-458 crew during credited period
- Limitations
- Official award-credit table (primary source, verbatim transcription on HyperWar): establishes the credited qualifying period and theater, not day-to-day operations or individual exposure. It documents occupation service, not what any person aboard did or contacted. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-458-02
-
[4]officialmilitaryribbons.com compilation of the Navy WWII operation-credit tables: Asiatic-Pacific P207 Minesweeping Operations Pacific, ship-level credits for YMS 458 [other_primary]
- Locator
- officialmilitaryribbons.com YMS-362-to-YMS-481 ship list, 'YMS 458' block; operation code table on the P207 companion page
- Finding type
- vessel_history
- Finding
- Operation-level credits listed for YMS 458: 7-25 October 1945, operation P207-3, Nagoya (Honshu Area); 20 December 1945 - 6 January 1946, operation P207-9, Kobe (Honshu Area); 14 January - 12 February 1946, operation P207-9, Kobe (Honshu Area). These are the Navy's post-surrender minesweeping operation designators for Japanese home-waters mine clearance.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-10-07 to 1946-02-12
- Population
- YMS-458 crew during sweeping operations
- Limitations
- Commercial medals vendor's transcription of official Navy operation-credit tables - the underlying primary table is authoritative but this rendering is secondary; the three operation periods sit inside the verified medal window (ev-02). Listed under the P207 minesweeping series. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-458-03
-
[5]shipbuildinghistory.com (Colton), Greenport Basin & Construction Co. yard table - PCS-1411 delivery row and merchant disposition [other_primary]
- Locator
- Greenport Basin yard table, row for PCS 1411
- Finding type
- vessel_history
- Finding
- Colton's Greenport yard table lists 'PCS 1411 | US Navy | Sub Chaser | 278d | 136 | 9-Oct-44 | Completed as YMS 458, sold 1947 as El Clare (ON 254246), later John M Morehead, scrapped 1978' - corroborating the PCS-1411 contract designation, 9 October 1944 completion/delivery, the 1947 merchant sale under official number 254246, the later John M. Morehead identity, and a 1978 end recorded as 'scrapped' (NavSource: 'abandoned').
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1978
- Population
- Greenport Basin construction trades (1943-44)
- Limitations
- Standard secondary shipbuilding-history compilation (drawn from merchant-vessel registry and yard records); 'Sub Chaser' is the table's generic PCS-type label, and 'scrapped 1978' conflicts with NavSource's 'abandoned in 1978' - final disposition form is unresolved. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-458-04
-
[6]uboat.net Allied Warships, USS YMS-458 (YMS-458) - builder, ordered/laid/launched/commissioned/stricken/sold dates, former-name field [other_primary]
- Locator
- uboat.net ship page 9875, facts table
- Finding type
- vessel_history
- Finding
- uboat.net corroborates the milestone spine with one additional data point - 'Ordered 16 Nov 1942' (the contract date, not in NavSource) - and lists 'Commissioned 9 Oct 1944,' which appears to carry the completion date as commissioning (NavSource distinguishes completed 9 Oct, commissioned 10 Oct). Also corroborates builder, laid down 3 Dec 1943, launched 12 Feb 1944, stricken 25 Feb 1947, sold 26 Sep 1947, former name PCS-1411.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-1947
- Limitations
- Secondary warship database; corroborative only. The 'commissioned 9 Oct 1944' cell conflicts with NavSource's 10 Oct commissioning and is treated here as the completion date (see gaps). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-458-05
-
[7]Era inference built on: NavSource spec block (two GM 8-268A diesels, two shafts; 136-ft YMS-1 class); class documentation that YMS-1-class hulls were wood-hulled, diesel-powered auxiliary motor minesweepers built largely by yacht and fishing-vessel yards for non-magnetic mine work; GAO HRD-80-2 (see ev-07) [other_primary]
- Locator
- NavSource 11/19458.htm specifications block; YMS-1 class general characteristics (NavSource class header / published class literature)
- Finding type
- asbestos_application
- Finding
- A wood-hulled, diesel-powered YMS-1-class minesweeper built 1943-44 sits inside the Navy's asbestos-insulation era, but the asbestos-relevant load aboard this type is small relative to steam tonnage: no boilers, no steam lines, no turbine lagging. Era-standard applications on a diesel minesweeper of this size were diesel exhaust lagging, machinery gaskets and valve packing, and electrical insulation; wood hull construction eliminates hull insulation runs. Any asbestos aboard would have been confined to machinery-space components and fittings.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1943-1978
- Population
- Greenport Basin construction trades (1943-44); USN crew (1944-46); merchant conversion/maintenance workers (1947-78)
- Limitations
- Class/era inference only - no hull-specific insulation list, material schedule, or work package was located for YMS-458. Names era-standard applications for the type, not confirmed installed materials aboard this hull; no quantity. Product names are normalized era terms; no manufacturer attribution.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-458-06
-
[8]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2 (full text blocked, HTTP 403)
- Finding type
- gov_survey
- Finding
- GAO documented that the Navy used asbestos insulation extensively aboard ships and did not begin substituting alternative insulation materials until the early 1970s - spanning this hull's entire construction (1943-44) and service era (1944-46).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1979
- Population
- Navy shipyard workers; asbestos program review
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403 - standing access defect noted since Batch 01) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-458-07
-
[9]Batch-8329 search ledger (this record): NavSource hull page; DANFS/NHHC (no entry exists); NVR (not covered); HyperWar awards-manual transcription; operation-credit compilation; Colton yard table; uboat.net; jounin.jp PCS list; NARA deck-log index; CourtListener (see ledger); secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-yms-458-01 through sl-uss-yms-458-11
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, material schedule, abatement contract, hazmat disclosure, or litigation naming YMS-458 (or its PCS-1411, El Clare, or John M. Morehead identities) was found in the public sources searched. CourtListener ran clean: all four authenticated base queries ('USS YMS-458' opinion and docket, 'YMS-458' opinion and docket) returned count 0 on 2026-10-04 - no docketed case or opinion names this hull. Secondary web sweeps surfaced no asbestos or litigation content at all - the hull is absent even from law-firm ship-listicle marketing.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - wooden hulls of this type still carried asbestos-containing gaskets, packing, and lagging in machinery spaces. Undigitized deck logs, BuShips work packages, and merchant-registry files are open leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-458-08