Evidence
11 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-11).
-
[1]research packet 1064-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-yms-4-yms4-pkt-1064-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-4 page - construction timeline, fleet assignment, striking, disposal, specifications [other_primary]
- Locator
- NavSource 11/19004.htm header block, specifications block
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: laid down 20 August 1941 by Henry B. Nevins Inc., City Island, NY; launched 14 March 1942; completed 1 May 1942; assigned to the Caribbean Sea Frontier; struck from the Naval Register 19 June 1946; transferred to the State Department, Foreign Liquidation Commission in October 1947; 'fate unknown.' Specifications: displacement 270 t.; length 136'; beam 24'6"; draft 8'; speed 15 kts.; complement 32; armament one 3"/50 dual purpose mount, two 20mm mounts, two depth charge projectors; propulsion two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts. Page states 'There is no DANFS history available for YMS-4' and no image is held. CO listing: LTJG J. B. Myers, USN, 1944.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1947
- Population
- Nevins construction trades (1941-42); crew (1942-46)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - milestone dates generally track Navy sources but are not themselves the record. 'Completed' rather than 'commissioned' is NavSource's phrasing (see gaps). Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-01
-
[3]NARA, Special List #44 - List of Logbooks of U.S. Navy Ships, Stations, and Miscellaneous Units, 1801-1947 (ship-number sequence), PDF p. 120 [other_primary]
- Locator
- sl-44-ship-number.pdf, page 120 (YMS block), row 'YMS-4 5/1/1942 6/30/1945'; digitized-status check against https://www.archives.gov/research/military/logbooks/navy-online
- Finding type
- historical_record
- Finding
- Special List 44 inventories a single deck-log series for YMS-4 covering 1 May 1942 - 30 June 1945 - the full commissioned-service span from completion through the end of WWII hostilities. These logs are held in RG 24 at the National Archives; the NARA 'Deck Logs Available Online' list does not include YMS-4, so the series is inventoried but not digitized in the public catalog as of this date.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-1945 (log coverage); inventoried 2026-10-04
- Population
- Crew (1942-45), the population these logs document
- Limitations
- Deck-log coverage dates are log-inventory bounds, not asserted commissioning/decommissioning dates. Logs not digitized - content unexamined; they are a retrieval lead, not evidence of any condition aboard. A digitization pipeline for WWII-era logs is ongoing at NARA, so online status may change.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-02
-
[4]uboat.net Allied Warships, USS YMS-4 (YMS-4) page - build/milestone table, commanding-officer list, and Operation Oboe VI (Brunei) order-of-battle/event transcription [other_primary]
- Locator
- uboat.net warships page 9424 - milestone table, 'Commands' list, 'Notable events' narrative (Operation Oboe VI)
- Finding type
- vessel_history
- Finding
- Documented service for this hull: ordered 11 December 1940; commissioned 1 May 1942; commanding officers listed for the war - A.E. Nichols USNR (May 1942-mid 1943), John Francis Maddox Jr. USNR (mid 1943-mid 1944), T.F. Davis USNR (mid 1944-mid/late 1944), William Douglas Lomax USNR (mid/late-late 1944), J.B. Myers USNR (late 1944-mid 1945), Lt.(jg) Floyd D. Bender USNR (mid 1945-early 1946). Notable event: Operation Oboe VI, Allied landings at Brunei, 10 June 1945 - YMS-4 (Lt.(jg) F.D. Bender) is listed in Sweep Unit Three (Task Unit 78.1.53) of the TG 78.1.5 Minesweeping Group with YMS-39, YMS-340 and YMS-365, and among the minesweepers screening Task Unit 76.20.50's return to Brunei Bay on 21 June 1945. The accompanying narrative, transcribed from an action report, records sustained mine clearance off Brunei Bay and the Miri-Lutong-Baram Point area from 7 June, with USS Salute (AM-294) mined and sunk on 8 June.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1940-1946
- Population
- Crew of 32 under Lt.(jg) Bender (Brunei operation, June 1945); wartime crew 1942-45
- Limitations
- uboat.net is a secondary compilation; the order of battle and narrative are transcribed from an official action report but the page itself is not the primary document. The credited operation-credit table (ev-04) lists YMS-4 for the overlapping Balikpapan operation (P37-3) rather than Brunei (P37-2) - the two assignments are consistent (sweep units worked both areas in June-July 1945) but the unit-level participation credit is not reconciled in a primary source here. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-03
-
[5]officialmilitaryribbons.com, 'United States Navy Ships World War II' YMS campaign-credit listing (compiled from the Navy's campaign/operation participation-credit tables) [other_primary]
- Locator
- YMS 1-200 page, 'YMS 4:' credit lines
- Finding type
- vessel_history
- Finding
- Campaign participation credit listed for YMS-4: P37-3, Balikpapan operation, 15 June - 15 July 1945; and P207, Minesweeping Operations Pacific, 10-18 December 1945. Together with the Brunei OOB (ev-03) this places the hull in Seventh Fleet Borneo-area minesweeping in mid-1945 and in post-surrender mine clearance in the Pacific in December 1945.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945
- Population
- Crew (Jun-Jul 1945; Dec 1945)
- Limitations
- Secondary compilation of the official Navy campaign-credit table, not the primary document - the underlying award manual entry was not independently pulled this session. Notably the table does NOT credit YMS-4 with P37-2 Brunei Bay (7-17 June 1945) although the action-report OOB places her in a Brunei sweep unit - carry as an unreconciled detail, not an error. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-04
-
[6]NavalCoverMuseum wiki, YMS-4 designation-history entry [museum_official]
- Locator
- NavalCoverMuseum YMS_4 page, 'Ship Name and Designation History' table
- Finding type
- vessel_history
- Finding
- Designation-history entry: keel laid 20 August 1941, launched 14 March 1942, completed 1 May 1942 (matches NavSource); 'placed in service (date unknown)' and 'placed out of service (date unknown)'; struck from the Naval Register 19 June 1946; transferred to the State Department Foreign Liquidation Commission October 1947; sold 21 October 1947.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1947
- Limitations
- Volunteer philatelic-museum wiki - a secondary source whose milepost dates track NavSource. It is the only located source giving an explicit sale date (21 October 1947); buyer and subsequent fate are not stated. 'Placed in service' vs 'commissioned' terminology differs across sources (see gaps). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-05
-
[7]NavSource YMS/BYMS index (class history) + NHHC YMS-445 page (class employment framing) [other_primary]
- Locator
- NavSource 11/19idx.htm class narrative; history.navy.mil YMS-445, 1945-47 page
- Finding type
- historical_record
- Finding
- Class context for the YMS-1 type: the first U.S. 'Yard class Minesweeper' (YMS-1) was laid down 4 March 1941 at the Henry B. Nevins yard, City Island - the class design is credited to that yard ('designed by this company'). The class was wood-hulled; 481 ships completed to one general design at 35 yacht yards (12 East Coast, 19 West Coast, 4 Great Lakes), used for inshore sweeping; survivors were reclassified AMS and named in 1947 - which never applied to YMS-4, struck in 1946. NHHC's YMS-445 page frames the type as 'yard craft' that patrolled navy yards and adjacent areas and supplied the Lend-Lease program.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1941-1946
- Limitations
- Class-level background - establishes the wood-hulled, small-craft, yard-built character of the type, not any condition aboard this specific hull. '561 built' vs '481 ships of this type' in the same NavSource text reflects the 80-ship BYMS lend-lease block inside the program total. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-06
-
[8]Shipbuilding History (T. Colton), Henry B. Nevins Yacht Builders, City Island NY - yard production table [other_primary]
- Locator
- nevins.htm production table, YMS rows
- Finding type
- vessel_history
- Finding
- The Nevins yard production table lists 'YMS 4, U.S. Navy, Minesweeper, 136 ft, Del'y 1-May-42, Struck 1946' - corroborating builder, delivery date, and striking year from the builder's-side compilation. The yard itself was a yacht yard: Henry B. Nevins bought the Hansen Boatyard at the foot of Winter Street, City Island, in 1907; Nevins built 24 YMS-1-class minesweepers for the Navy plus aircraft-rescue boats during the war; the yard sold in 1954 and closed in 1962 (site now City Island's PS 175).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1941-1946
- Population
- Nevins construction trades (1941-42)
- Limitations
- Well-regarded secondary shipyard-history compilation, not a primary registry - used here as builder-side corroboration of NavSource/NavalCoverMuseum mileposts. Yard-level construction detail (materials, subcontractors) is not in the table. No asbestos content. Henry B. Nevins Inc. is not an Atlas shipyards.json yard - see gaps.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-07
-
[9]Era inference built on: NavSource specifications (two GM 8-268A diesels, two shafts; wood hull per class page) + GAO HRD-80-2 program documentation (ev-09) + class design credited to Nevins yard [other_primary]
- Locator
- NavSource specs + class page (wood hull, diesel plant); GAO HRD-80-2 era documentation
- Finding type
- asbestos_application
- Finding
- A wood-hulled, diesel-powered minesweeper built 1941-42 sits inside the Navy's documented asbestos era but presents a materially smaller asbestos surface than steam combatants: no boilers, no steam lines, no turbine lagging. Era-standard asbestos applications on a small diesel minecraft of this period were engine and exhaust lagging, machinery gaskets and packing, electrical insulation, and composition deck coverings - small-quantity, maintenance-disturbance exposures rather than steam-plant lagging fields.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1941-1947
- Population
- Nevins construction trades (1941-42); engine-room and deck crew (1942-46); any post-war purchasers of the sold hull (1947-)
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, or work package located for YMS-4. Names era-standard applications, not confirmed installed materials; no quantity; no manufacturer attribution. The wood hull removes the structural-insulation pathway of steel combatants, but does not remove machinery, gasket, electrical, or deck-covering applications.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-08
-
[10]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 construction (1941-42) and entire service life (1942-46).
- 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, confirmed 2026-10-04) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-09
-
[11]Batch-9036 search ledger (this record): NavSource ship page + YMS class index; NARA Special List 44 PDF + online-logs list; uboat.net vessel page; NavalCoverMuseum; shipbuildinghistory Nevins table; NHHC site search; campaign-credit compilation; CourtListener opinion base query; secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-yms-4-01 through -10
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or qualifying litigation naming USS YMS-4 was found in the public sources searched (see search_ledger). CourtListener opinion search for "YMS-4" returned zero results; the remaining three base queries (docket, and 'USS YMS-4' in both indexes) are pending fleet pacing budget this session - opinion-space result is a genuine zero, docket-space coverage is partial. Secondary web sweeps surfaced no qualifying case or asbestos documentation; the only 'asbestos aboard' material is law-firm marketing content on generic YMS/minesweeper listicles with no primary sourcing - excluded by source policy.
- 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. The strongest untapped leads are the undigitized RG 24 deck logs (SL44 p.120: May 1942-Jun 1945) and any FLC disposal file for the October 1947 sale. CourtListener coverage partial this session - see search_ledger for which queries ran vs remain pending. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-4-10