Evidence
12 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-12).
-
[1]research packet 1068-packet.md (4 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-yms-426-yms426-pkt-1068-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-426 - construction, completion, Tokyo Bay presence, disposal, specs, commanding officer, Kure photo (live page verified 2026-10-04) [other_primary]
- Locator
- NavSource 11/19426.htm header block, specifications block, commanding-officer table, photo caption
- Finding type
- vessel_history
- Finding
- Documented for this hull: YMS-1 Class Auxiliary Motor Minesweeper; laid down 30 September 1943 by Mojean and Erickson, Tacoma, WA; launched 9 February 1944; completed 25 September 1944; 'Present in Tokyo Bay during Japanese surrender ceremony in September 1945'; struck from the Naval Register 10 June 1947; 'Transferred to the War Shipping Administration 17 June 1947 and sold. Fate unknown.'; call sign Nan-Queen-Love-Charlie; commanding officer LT M. R. Ball, Jr., USNR (1945); 'There is no DANFS history currently available for YMS-426.' Spec block: displacement 270 t.; length 136'; beam 24'6"; draft 8'; speed 13 kts.; complement 50; armament one 3"/50 dual purpose gun mount, two 20mm mounts and one depth charge projector; propulsion two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts. One photo posted: c. October 1945, Inland Sea off Kure, Japan, from the collection of LT Bernard M. Greenwald, MC, USNR, USS Picket (ACM-8).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1947
- Population
- Mojean and Ericson yard construction trades (1943-44); crew (Sep 1944 - 1947)
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - its milestone dates track NVR/DANFS-era data. Spec-block figures differ from its own sister-hull pages (complement 50 here vs 32 on YMS-411; one depth charge projector vs two) - variance flagged, not resolved to primary. The Tokyo Bay statement is corroborated by an official NHHC list (ev-05). Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-01
-
[3]uboat.net Allied Warships, USS YMS-426 (YMS-426) - milestones table (live page verified 2026-10-04) [other_primary]
- Locator
- uboat.net ship page 9845, milestones table ('History' lines)
- Finding type
- vessel_history
- Finding
- uboat.net documents for this hull: built by Mojean and Ericson Shipbuilding Corp. (Tacoma, Washington); ordered 21 July 1943; laid down 30 September 1943; launched 9 February 1944; commissioned 25 September 1944; 'Stricken on 10 June 1947'; 'Sold on 17 June 1947.' The page lists no commanding officers and no notable events for this hull.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1947
- Population
- Crew (1944-1947)
- Limitations
- uboat.net is a curated secondary database (Gudmundur Helgason) compiled from operational records - not a primary document; the deck logs (ev-03) would be the primary record. Builder-name spelling 'Ericson' here vs 'Erickson' on NavSource - minor variant noted in gaps. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-02
-
[4]National Archives Special List #44 - List of Logbooks of U.S. Navy Ships, Stations, and Miscellaneous Units, 1801-1947 (ship-number ordering), PDF page 121 [other_primary]
- Locator
- sl-44-ship-number.pdf p. 121, entry 'YMS-426 9/25/1944 6/30/1945'
- Finding type
- historical_record
- Finding
- NARA's official inventory lists one deck-log entry for YMS-426: coverage 25 September 1944 - 30 June 1945, spanning her completion/commissioning (25 Sep 1944) through the Iwo Jima credit window (17 Feb-16 Mar 1945) and the start of the Okinawa window (27-30 Jun 1945), and covering the 1 May 1945 fleet-organization listing date (ev-04). The logs are held at NARA in the deck-log series inventoried by Special List 44 (Records of the Bureau of Naval Personnel, RG 24).
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1944-09-25 to 1945-06-30
- Population
- Crew (Sep 1944 - Jun 1945); names and daily movements inside the undigitized log
- Limitations
- Inventory entry only - the logbook itself is not digitized on the National Archives 'Navy Deck Logs Available Online' listing (checked 2026-10-04; only named ex-YMS vessels appear there), so its contents are an unexamined primary source. YMS-426 served until mid-1947 (struck 10 Jun 1947), but no post-30-June-1945 logbook for her appears in this inventory - the Third Fleet, Tokyo Bay, and Japanese home-waters minesweeping operations all fall outside the inventoried coverage; whether later logs exist in another accession series is unresolved. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-03
-
[5]NHHC, 'United States Pacific Fleet Organization, 1 May 1945' - MINECRAFT, PACIFIC FLEET section, YMS roster (official document transcription hosted by NHHC) [nhhc_danfs]
- Locator
- NHHC Online Reading Room page, 'MINECRAFT, PACIFIC FLEET' YMS roster row '94 | YMS 426 | (1) | Lt. M. R. Ball, Jr. (USNR)'; 'TACTICAL ORGANIZATION' table row 'Task Force 94 | Forward Area, CentPac'
- Finding type
- vessel_history
- Finding
- The 1 May 1945 Pacific Fleet organization lists 'YMS 426' under MINECRAFT, PACIFIC FLEET (Commander Minecraft, Pacific Fleet: Rear Admiral A. Sharp) in the YMS roster, with commanding officer 'Lt. M. R. Ball, Jr. (USNR)', footnote marker '(1)', and assignment code '94' in the leading column. The same document's tactical-organization table maps 'Task Force 94' to 'Forward Area, CentPac' (V. Adm. J. H. Hoover). This places the hull in U.S. Pacific Fleet service under the minecraft commander in spring 1945, consistent with her Iwo Jima/Okinawa campaign credits (ev-06) and her documented Tokyo Bay presence (ev-05).
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-05-01
- Population
- Crew under Lt. M. R. Ball, Jr., USNR (spring 1945)
- Limitations
- Organizational document: it establishes fleet assignment and commanding officer as of 1 May 1945, not geographic position or operations performed. The leading-column codes are not labeled by a column header in the transcription; the '94' = Task Force 94 (Forward Area, Central Pacific) reading matches the document's own tactical-organization table but is an interpretive link - hence partial. The CO corroborates NavSource's LT M. R. Ball, Jr., USNR (1945) listing. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-04
-
[6]NHHC, 'Allied Ships Present in Tokyo Bay During the Surrender Ceremony, 2 September 1945' - Motor Mine Sweeper (YMS) section; sourced to CINCPAC/CINCPOA A16-3/FF12 Serial 0395 (11 February 1946), Report of Surrender and Occupation of Japan [nhhc_danfs]
- Locator
- NHHC page, 'Motor Mine Sweeper (YMS)' category list (YMS-177/-268/-276/-343/-362/-371/-390/-415/-426/-441/-461/-467); Sources paragraph citing CINCPAC A16-3/FF12 Ser 0395
- Finding type
- historical_record
- Finding
- The official Navy Department Library transcription lists 'YMS-426' among twelve YMS hulls under 'Motor Mine Sweeper (YMS)' in 'Allied Ships Present in Tokyo Bay During the Surrender Ceremony, 2 September 1945.' The page cites its source as 'Commander in Chief, U.S. Pacific Fleet and Pacific Ocean Areas (CINCPAC/CINCPOA) A16-3/FF12 Serial 0395, 11 February 1946: Report of Surrender and Occupation of Japan. Additions and subtractions made based on war diary, deck log and other sources.' This is the official-document corroboration of NavSource's 'Present in Tokyo Bay during Japanese surrender ceremony' line, and it is consistent with the P207-2 Tokyo Bay campaign credit (ev-06) covering 28 Aug - 3 Sep 1945.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-09-02
- Population
- Crew (Sep 1945)
- Limitations
- List membership documents presence in Tokyo Bay during the ceremony period; it does not by itself document where in the bay she anchored or what she did there, and the NHHC page notes the list was adjusted against war diaries and deck logs (the underlying log for this hull is the undigitized ev-03 record). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-05
-
[7]Secondary reproduction of U.S. Navy WWII campaign/battle-star data (officialmilitaryribbons.com, 'Navy Ship World War 2 Campaign Battle Stars, YMS 362 to YMS 481') [other_primary]
- Locator
- Page block 'YMS 426:' - eight credit rows (P33-1, P34-1, P35, P207-23, P207-2, P207-7, P207-3, P207-9)
- Finding type
- historical_record
- Finding
- A secondary compilation of Navy WWII campaign-credit data lists eight entries for YMS-426: P33-1 'Assault and occupation of Iwo Jima' (17 Feb - 16 Mar 1945); P34-1 'Assault and occupation of Okinawa Gunto' (27 - 30 Jun 1945); P35 '3d Fleet operations against Japan' (5 - 31 Jul 1945); P207-23 '"Skagway"' East China Sea-Ryukyus area (14 - 24 Aug 1945); P207-2 Tokyo Bay, Honshu area (28 Aug - 3 Sep 1945); P207-7 Bungo-Suido, Honshu area (22 Sep - 10 Oct 1945); P207-3 Nagoya, Honshu area (14 - 25 Oct 1945); P207-9 Kobe, Honshu area (20 Dec 1945 - 2 Mar 1946). Unlike sister YMS-411 (two bare P207 credits), YMS-426's credits carry named sub-areas spanning combat operations at Iwo Jima and Okinawa and post-surrender minesweeping across Japanese home waters.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-02-17 to 1946-03-02
- Population
- Crew (Feb 1945 - Mar 1946)
- Limitations
- Commercial vendor page reproducing official Navy battle-star/campaign-credit data - not itself an authoritative source, and the reproduction is unverified against the OPNAV source document. The Iwo Jima window (Feb-Mar 1945) precedes the May 1945 fleet-org listing and part of it falls inside the inventoried deck-log coverage; the Jul-1945-and-later credits fall after the SL-44 log coverage ends (30 Jun 1945) - the logs documenting those operations are not in the inventory. The Tokyo Bay credit is independently corroborated by the NHHC list (ev-05). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-06
-
[8]shipbuildinghistory.com (Tim Colton yard compilation), Yard Minesweepers (YMS) table; mirrored at navalmarinearchive.com (sbh/smallships/ym.html) [other_primary]
- Locator
- ym.htm table row 'YMS | 426 | Mojean & Ericson | Tacoma WA | 136 | 320 | 25-Sep-44 | Struck 1946'; header production note; mirror row at navalmarinearchive.com/sbh/smallships/ym.html
- Finding type
- vessel_history
- Finding
- The YMS yard table carries the row 'YMS | 426 | Mojean & Ericson | Tacoma WA | 136 | 320 | 25-Sep-44 | Struck 1946' - corroborating the builder, the 136-ft length, the 25-Sep-44 delivery, and disposal by striking. The table's header note documents the class production: 561 wooden-hulled minesweepers built at 35 boatyards spring 1942 - spring 1945, all of essentially the same 136-ft/13-kt design; the Mk II variant (single stack) covered YMS 135-445, which includes this hull.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1947
- Population
- Mojean and Ericson yard construction trades (1943-44)
- Limitations
- Secondary yard compilation (Tim Colton), not a primary registry. Its disposal note 'Struck 1946' conflicts with NavSource and uboat.net (both: struck 10 June 1947) - carried as a flagged conflict (ev-09), not resolved to primary. Delivery dates in the table are completion/delivery, not laid-down. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-07
-
[9]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) - product-page highlights [gao]
- Locator
- GAO product page HRD-80-2, Highlights section (verified live via Firecrawl 2026-10-04)
- Finding type
- gov_survey
- Finding
- GAO reviewed the Navy's efforts to protect workers from asbestos exposure at the Long Beach and Norfolk Naval Shipyards, including 'the use of asbestos in Navy ships'; the product-page highlights document that the Navy's 1975 policy was to 'remove and replace with nonasbestos materials only insulation that was damaged or had to be removed to accomplish necessary repairs,' modified in 1979 to include selectively replacing asbestos insulation in high-maintenance areas where repairs would be expected during a ship's next operating cycle - i.e., asbestos insulation was present and managed (not systematically removed) aboard Navy ships through the era covering this hull's construction (1943-44) and U.S. service (1944-47).
- 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 from the product-page highlights; supports era context only, not any fact specific to this hull - the reviewed fieldwork yards were Long Beach and Norfolk, not Tacoma. Full report PDF returns HTTP 403 to automated fetch. The policy language postdates this hull's 1947 disposal; it characterizes the era's asbestos-management posture, not this vessel's materials.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-08
-
[10]Era inference built on: NavSource spec block (2 x GM 8-268A diesels, 880 bhp; wooden-hulled YMS-1-class per the NavSource YMS/BYMS index class description); shipbuildinghistory class note (561 wooden-hulled minesweepers at 35 boatyards, Mk II single-stack variant YMS 135-445); uboat.net class data; GAO HRD-80-2 (see ev-08) [other_primary]
- Locator
- NavSource 11/19426.htm spec block and 11/19idx.htm class description; shipbuildinghistory ym.htm class note; uboat.net YMS class data
- Finding type
- asbestos_application
- Finding
- A wooden-hulled diesel-powered motor minesweeper completed in 1944 sits inside the Navy's documented asbestos-use era; era-standard applications aboard a small diesel combatant of this type and period were exhaust-system lagging, machinery and engine gaskets, valve packing, electrical insulation, and brake linings on winch and sweep gear. As a diesel vessel she carried no steam plant - the boiler/turbine lagging pathway of steam vessels does not apply - and her wooden hull lacked the pipe runs and hull insulation typical of steel steam ships, narrowing (not eliminating) the era-typical asbestos applications.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1943-1947
- Population
- Mojean and Ericson construction trades (1943-44); crew (1944-47)
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, or work package located for YMS-426. Names era-standard applications, not confirmed installed materials. No quantity. Product names are normalized era terms; no manufacturer attribution for this hull.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-09
-
[11]Strike-date cross-check: NavSource YMS-426 page ('Struck from the Naval Register 10 June 1947'); uboat.net ship 9845 ('Stricken on 10 June 1947 / Sold on 17 June 1947'); shipbuildinghistory YMS table ('Struck 1946'); NavSource disposal line ('Transferred to the War Shipping Administration 17 June 1947 and sold') [other_primary]
- Locator
- NavSource 11/19426.htm header block; uboat.net ship 9845 milestones table; shipbuildinghistory.com ym.htm table row
- Finding type
- historical_record
- Finding
- CONFLICT NOTED: the shipbuildinghistory YMS table's disposal cell reads 'Struck 1946' while NavSource and uboat.net both give 10 June 1947 for the Naval Register strike, followed within a week by transfer to the War Shipping Administration (17 Jun 1947) and sale. Two independent secondary sources agree on the 1947 dates, and the yard table's 'Struck 1946' appears to be a summary-cell simplification (the same table prints 'Struck 1946' for sister YMS-427, which NavSource likewise dates to 1947). The record carries 1947-06-10 with the variant retained in gaps.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1946-1947
- Limitations
- Corrects/flags a milestone conflict, not a material or asbestos claim. None of the three sources is a primary registry; the Naval Vessel Register / BuShips striking record would settle it. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-10
-
[12]Batch-9066 search ledger (this record): NavSource; uboat.net; NARA Special List 44 PDF; NARA digitized-deck-log listing; NHHC U.S. Pacific Fleet Organization 1 May 1945; NHHC Allied Ships Present in Tokyo Bay; NHHC Pacific Typhoon extract (probed - hull not listed); NHHC DANFS probe; NVR live probe; NavalCoverMuseum; battle-star compilation; shipbuildinghistory YMS table + navalmarinearchive mirror; secondary web litigation sweep; Wikipedia cross-check; CourtListener (see search_ledger sl-16) [other_primary]
- Locator
- search_ledger rows sl-uss-yms-426-yms426-01 through -16
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or verified litigation naming USS YMS-426 was found in the public sources searched. CourtListener base queries were only partially run this session: 'USS YMS-426' opinion search returned 0 results; the remaining three base queries could not be run - the fleet-wide pacing budget stayed spent through spaced retries (helper exit 2; shared ~58/hr cap under fleet load) - logged as blocked in search_ledger, not as a negative result. Secondary web sweeps surfaced no qualifying case and no law-firm marketing content naming this hull specifically (no hits at all beyond the NHHC fleet-organization page). No post-sale identity located - fate after the June 1947 WSA sale unknown.
- 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 - and the litigation repository search is only partially run (1 of 4 base queries; remaining 3 blocked, a genuine open gap). Deck logs (NARA, undigitized) and Mojean and Ericson yard records are open leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-426-yms426-11