Evidence
13 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-13).
-
[1]research packet 1070-packet.md (3 sources cited) [museum_official]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED (thin sourcing
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Limitations
- qualifier: VERIFIED (thin sourcing
- Evidence ID
- uss-yms-436-yms436-pkt-1070-packet-md
-
[2]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-436 - construction, commissioning, disposal, merchant registrations, specs, commanding officer, Yokkaichi photo (live page verified 2026-10-04) [other_primary]
- Locator
- NavSource 11/19436.htm header block, call-sign flags, specifications block, photo caption (c. 1945 Yokkaichi Thanksgiving)
- Finding type
- vessel_history
- Finding
- Documented for this hull: YMS-1 Class Auxiliary Motor Minesweeper; laid down 15 June 1944 by the J. M. Martinac Shipbuilding Corp., Tacoma, WA; launched 14 March 1945; 'Completed and commissioned USS YMS-436, 31 May 1945' under the command of LT J. W. Nelson, USNR; decommissioned 1 January 1947; struck from the Naval Register 5 March 1947; 'Transferred to the War Shipping Administration 13 May 1947'; 'Registered in 1948 to Velero II, Inc. of Los Angeles, CA as the miscellaneous use vessel La Obra out of Los Angeles'; 'Registered in 1949 to Independent Tankships, Inc. of Washington, DC as the miscellaneous use vessel Badawy out of Wilmington, DE'; 'Operated in 1952 under the Saudi Arabian flag. Fate unknown.' Call signs NCAC (wartime) and KQIF (La Obra, 1948). Spec block: displacement 270 t. (1948: 250 t.); length 136' (1948: 126.5'); beam 24'6"; draft 8' (1948: 11.5'); speed 15 kts.; complement 32 (1948: six); armament one 3"/50 dual purpose gun 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. One photo posted: c. 1945, Yokkaichi, Japan - ship's officers at Thanksgiving dinner, rear inscribed 'L. M. Riechman'. 'There is no DANFS History currently available for YMS-436.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1944-1952
- Population
- Martinac yard construction trades (1944-45); crew (May 1945 - Jan 1947); merchant crews 1948-forward
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - its milestone dates generally track NVR/DANFS-era data. The 1948 figures reflect merchant re-measurement; the wartime spec block prints speed 15 kts vs the class-typical 13 kts printed on sister-hull NavSource pages (e.g., YMS-426) - variance flagged, not resolved to primary. The Yokkaichi caption is c.1945 Thanksgiving and does not state what the ship was doing there. Contains no asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-01
-
[3]uboat.net Allied Warships, USS YMS-436 (YMS-436) - milestones table (live page verified 2026-10-04) [other_primary]
- Locator
- uboat.net ship page 9855, milestones table ('History' lines)
- Finding type
- vessel_history
- Finding
- uboat.net documents for this hull: built by J. M. Martinac Shipbuilding Corp. (Tacoma, Washington, U.S.A.); ordered 12 August 1943; laid down 15 June 1944; launched 15 March 1945; commissioned 31 May 1945; 'Stricken on 5 March 1947'; 'Sold on 13 May 1947.' The page lists no commanding officers and no events for this hull.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1947
- Population
- Crew (1945-1947)
- Limitations
- uboat.net is a curated secondary database (Gudmundur Helgason) compiled from operational records - not a primary document; the deck logs would be the primary record and none are inventoried for this hull (ev-08). Launched date differs by one day from NavSource (15 Mar vs 14 Mar 1945) - flagged conflict (ev-11). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-02
-
[4]Department of the Navy, Navy and Marine Corps Awards Manual, NAVPERS 15,790 (Rev. 1953), Part IV 'Campaign and Service Medals', Section 2(18) 'Navy Occupation Service Medal and China Service Medal (Extended)', II. Units Eligible - (A) Ships, printed page 213 (HyperWar reproduction, ibiblio.org) [other_primary]
- Locator
- HyperWar Awards-IV-17.html, Part IV Section 2 subsection (18), 'II. UNITS ELIGIBLE - (A) SHIPS', table row 'YMS 436' on printed page 213 (between the '-- 212 --' and '-- 213 --' page markers); regulations text at Part IV Section 2(18)(A) paras 7 and 11
- Finding type
- vessel_history
- Finding
- The official awards manual's eligible-ships table carries the row 'YMS 436 | 12 Sep 45 - 11 Mar 46 | A' - crediting this hull with Navy Occupation Service Medal service in the Asiatic-Pacific area for the window 12 September 1945 - 11 March 1946 with the 'A' (Asia) clasp. The manual's regulations state occupation duty in the Asiatic-Pacific area was credited to organizations for duty performed between 2 September 1945 and 27 April 1952; this hull's credited window starts ten days after the 2 September surrender ceremony (consistent with her absence from the NHHC Tokyo Bay list - she had not yet reached Japan) and brackets the bulk of her post-surrender service before her January 1947 decommissioning. This is the single strongest ship-specific record located: a government publication crediting hull-specific operational Navy service in occupied Japanese waters, corroborated by the NavSource photograph of her officers at Yokkaichi, Japan, at Thanksgiving 1945 and by the P207-9 Kobe-area minesweeping credit (ev-05).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-09-12 to 1946-03-11
- Population
- Crew (Sep 1945 - Mar 1946 occupation window)
- Limitations
- Documents service-eligibility credit, not daily position or specific sweep operations; the table entry alone does not name the operating area (the Kobe-area attribution comes from the separate campaign-credit reproduction, ev-05). NHHC hosts a landing page for this manual (history.navy.mil .../navy-mc-awards-manual-rev1953.html returns 200 with a browser user-agent) but the Part IV ship table is not served in the loaded content - the HyperWar reproduction (ibiblio.org) is the readable text and is cited as such. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-03
-
[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 'YMS 436 | (1) | ..........' (inside the '94' block); 'TACTICAL ORGANIZATION' table row 'Task Force 94 | Forward Area, CentPac'
- Finding type
- vessel_history
- Finding
- The 1 May 1945 Pacific Fleet organization lists 'YMS 436' under MINECRAFT, PACIFIC FLEET (Commander Minecraft, Pacific Fleet: Rear Admiral A. Sharp) in the YMS roster, inside the block coded '94' in the leading column, with a '(1)' footnote marker and a blank ('..........') commanding-officer column. Notably, the document predates her 31 May 1945 commissioning by a month - the roster anticipates the hull's entry into service. The same document's tactical-organization table maps 'Task Force 94' to 'Forward Area, CentPac' (V. Adm. J. H. Hoover).
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-05-01
- Population
- Prospective crew (spring 1945)
- Limitations
- Organizational document: it establishes an anticipated fleet assignment as of 1 May 1945 - before commissioning - not operations performed. The leading-column codes are not labeled by a column header in the transcription; the '94' = Task Force 94 reading matches the document's own tactical table but is an interpretive link. The '(1)' footnote marker and the blank CO column are consistent with a not-yet-commissioned hull but the footnote text itself is unresolved in the transcription - hence partial. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-04
-
[6]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 436:' - single credit row (P207-9 Kobe, Honshu Area, 20 Dec 45 - 2 Mar 46)
- Finding type
- historical_record
- Finding
- A secondary compilation of Navy WWII campaign-credit data lists exactly one entry for YMS-436: P207-9 Kobe (Honshu Area), 20 December 1945 - 2 March 1946 - a post-surrender minesweeping-area credit consistent with the awards manual's Asiatic occupation-service window (12 Sep 1945 - 11 Mar 1946, ev-03) and with the NavSource photograph placing her officers at Yokkaichi, Japan (Ise Bay area), at Thanksgiving 1945.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-12-20 to 1946-03-02
- Population
- Crew (Dec 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 Kobe window (Dec-Mar) sits inside the awards manual's longer occupation-service window; the single credit is consistent with her commissioning too late for combat operations. The Yokkaichi photo corroborates presence in the Japanese home islands during the period but documents officers ashore at dinner, not sweep operations. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-05
-
[7]shipbuildinghistory.com (Tim Colton yard compilation), Yard Minesweepers (YMS) table [other_primary]
- Locator
- ym.htm table row 'YMS | 436 | Martinac Shipbuilding | Tacoma WA | 136 | 320 | 31-May-45 | Struck 1946'; header production note; adjacent Martinac rows YMS-434/-435/-437
- Finding type
- vessel_history
- Finding
- The YMS yard table carries the row 'YMS | 436 | Martinac Shipbuilding | Tacoma WA | 136 | 320 | 31-May-45 | Struck 1946' - corroborating the builder, the 136-ft length, and the 31-May-45 delivery/completion; the 'Struck 1946' disposal cell conflicts with NavSource and uboat.net (5 March 1947) and is flagged as a conflict (ev-11). 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 design; the Mk II single-stack variant covered YMS 135-445, which includes this hull. Sister hulls in the same yard block: YMS-434 (to Parrakeet/AMS 30), YMS-435 (to the USSR as T-526 in 1945), YMS-437 (to Partridge/AMS 31, mined in Wonsan Harbor and lost 1951).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1944-1947
- Population
- Martinac yard construction trades (1944-45)
- Limitations
- Secondary yard compilation (Tim Colton), not a primary registry. 'Struck 1946' is a table simplification that repeats across hulls NavSource dates to 1947 - carried as a flagged conflict, 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-436-yms436-06
-
[8]HistoryLink.org (Washington state history encyclopedia), File 22440, 'J. M. Martinac Shipbuilding Corporation (Tacoma)' [reputable_press]
- Locator
- HistoryLink File 22440, 'World War II' production paragraphs (1941 minesweeper contract, YMS-125 launch, follow-on orders, 'work on the minesweeper program continued into 1945')
- Finding type
- historical_record
- Finding
- The state-history encyclopedia documents this hull's builder: J. M. Martinac founded his Tacoma yard (Thea Foss Waterway) in 1924, primarily building fishing vessels; in summer 1941 Martinac won a Navy contract for four 135-foot wooden minesweepers worth $1,315,200 (plus patrol-craft conversions), launching its first sweeper YMS-125 on 18 December 1941; additional Navy contracts followed (12 more minesweepers; YMS-216 launched October 1942) with minesweeper work continuing into 1945, alongside four 110-foot Navy tugs (1943) and the refrigerated cargo ships YP-637 and YP-638. The yard's WWII minesweeper production run covers this hull's construction window (laid down June 1944, delivered May 1945 - third-to-last of the Martinac YMS block 434-437 per the shipbuildinghistory table).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1941-1945
- Population
- Martinac yard construction trades (1941-45)
- Limitations
- Yard-level history, not a hull record: documents the builder's wartime wooden-minesweeper program, not YMS-436 by name, and contains no asbestos, materials, or workforce-exposure information. HistoryLink is Washington State's official online encyclopedia (staff-reviewed essays) - reputable secondary source, not a primary registry. Martinac is a wooden-boat yard; no yard-specific asbestos documentation was located for it.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-07
-
[9]National Archives Special List #44 - List of Logbooks of U.S. Navy Ships, Stations, and Miscellaneous Units, 1801-1947 (ship-number ordering), plus NARA 'Navy Deck Logs Available Online' listing [other_primary]
- Locator
- sl-44-ship-number.pdf YMS block (YMS-435 then YMS-438; no YMS-436 row); archives.gov/research/military/logbooks/navy-online (no YMS-436 listing)
- Finding type
- historical_record
- Finding
- NO logbook for YMS-436 appears in the Special List 44 ship-number inventory: the YMS sequence runs YMS-435 (3/5/1945 - 5/16/1945) directly to YMS-438 (10/26/1944 - 6/30/1945) with no YMS-436 entry between them (PDF p. 121 vicinity, verified by pdftotext -layout extraction). The hull commissioned 31 May 1945 and decommissioned 1 January 1947, so her logbooks - if maintained and deposited - fall inside SL-44's 1801-1947 coverage yet are absent from the inventory. She likewise does not appear on the NARA 'Navy Deck Logs Available Online (1941 and later)' listing, where only named ex-YMS vessels (AMS/MSCO conversions) appear. Deck logs, if extant, are an unexamined primary record in another accession series.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-1947
- Population
- Crew (May 1945 - Jan 1947) - names and movements would be in the logs if extant
- Limitations
- Absence from the SL-44 inventory does not prove no logbooks exist - it establishes only that none are inventoried in that RG 24 series. Post-1947-series or wartime deposited logs are an open lead. The SL-44 absence is a finding about records, not about the ship's operations. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-08
-
[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-10) [other_primary]
- Locator
- NavSource 11/19436.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 May 1945 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
- 1944-1952
- Population
- Martinac construction trades (1944-45); crew (1945-47); merchant crews and any conversion-yard workers 1947-forward
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, or work package located for YMS-436. 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-436-yms436-09
-
[11]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 (1944-45) and U.S. service (1945-47).
- 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, and the policy language postdates this hull's 1947 disposal; it characterizes the era's asbestos-management posture, not this vessel's materials. Full report PDF returns HTTP 403 to automated fetch.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-10
-
[12]Milestone cross-check: NavSource YMS-436 page (launched 14 March 1945; struck 5 March 1947; decommissioned 1 January 1947; WSA transfer 13 May 1947); uboat.net ship 9855 (launched 15 March 1945; stricken 5 March 1947; sold 13 May 1947); shipbuildinghistory YMS table ('31-May-45 ... Struck 1946') [other_primary]
- Locator
- NavSource 11/19436.htm header block; uboat.net ship 9855 milestones table; shipbuildinghistory.com ym.htm table row
- Finding type
- historical_record
- Finding
- CONFLICTS NOTED: (1) Launch date - NavSource prints 14 March 1945, uboat.net prints 15 March 1945; unresolved one-day conflict. (2) Strike year - the shipbuildinghistory YMS table's disposal cell reads 'Struck 1946' while NavSource and uboat.net both give 5 March 1947, followed by the War Shipping Administration transfer/sale 13 May 1947; the table's 'Struck 1946' is a repeated summary-cell simplification across YMS hulls (sister YMS-426's record carries the same pattern). The record carries launched 1945-03-14 (NavSource) and struck 1947-03-05 with the variants retained in gaps.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-1947
- Limitations
- Corrects/flags milestone conflicts, not material or asbestos claims. None of the three sources is a primary registry; the Naval Register / BuShips striking record would settle the strike date. The 'Sold 13 May 1947' (uboat.net) vs 'Transferred to the War Shipping Administration 13 May 1947' (NavSource) phrasing difference is also noted - WSA disposal typically proceeded by sale to merchant registrants, consistent with the 1948 La Obra registration. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-11
-
[13]Batch-9077 search ledger (this record): NavSource; uboat.net; NAVPERS 15,790 Awards Manual via HyperWar (p. 213 verified); NHHC U.S. Pacific Fleet Organization 1 May 1945; NHHC Allied Ships Present in Tokyo Bay (probed - hull not listed); NHHC awards-manual landing page probe; NHHC DANFS probe; NVR live probe; NARA Special List 44 PDF + digitized-logs listing; NavalCoverMuseum; battle-star compilation; shipbuildinghistory YMS table; HistoryLink Martinac yard history; GAO product page; secondary web litigation/asbestos sweep; Wikipedia cross-check; CourtListener (see search_ledger) [other_primary]
- Locator
- search_ledger rows sl-uss-yms-436-yms436-01 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-436 was found in the public sources searched. CourtListener base queries were only partially run this session: 'USS YMS-436' opinion search returned HTTP 200 count 0; 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. She is affirmatively ABSENT from the NHHC 'Allied Ships Present in Tokyo Bay' surrender-ceremony list (her occupation credit begins 12 Sep 1945, ten days after the ceremony - consistent, not contradictory). Merchant-phase fate after 1952 (Saudi flag) is undocumented.
- 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 (not in SL-44; undigitized), Martinac yard records, WSA/MARAD disposal file, and merchant registers (Merchant Vessels of the United States / Lloyd's) for La Obra and Badawy are open leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-436-yms436-12