Evidence
12 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-12).
-
[1]research packet 1069-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERDICT: VERIFIED (thin sourcing)
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Limitations
- qualifier: VERDICT: VERIFIED (thin sourcing)
- Evidence ID
- uss-yms-433-yms433-pkt-1069-packet-md
-
[2]National Archives, Special List 44: List of Logbooks of U.S. Navy Ships, Stations, and Miscellaneous Units, 1801-1947 (NARA, 1978), 'Ships by Signal Number Designation' T-Y section, typeset ship-number PDF [other_primary]
- Locator
- SL44 typeset ship-number PDF p. 121: 'YMS-433 2/13/1945 6/30/1945'
- Finding type
- historical_record
- Finding
- Special List 44 inventories US Navy deck logs for YMS-433 covering 2/13/1945 through 6/30/1945 - coverage opening on her completion/commissioning date (13 February 1945) and closing fourteen months before her striking (28 August 1946). The 4.5-month window spans her shakedown and transit period and the final months of the Pacific war; a post-June-1945 log series is not shown in this inventory entry even though the hull remained in service through mid-1946 (the NAVPERS engagement-star list credits September 1945 minesweeping operations that postdate the inventory's log window).
- Verification
- verified
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945 (log coverage); inventory published 1978
- Population
- YMS-433 crew, February-June 1945 (log coverage period)
- Limitations
- This is an inventory entry, not the logs themselves: it establishes that logbooks exist (RG 24-era custody, NARA) but not their contents - stations, operations, personnel, or any aboard conditions are unread here. YMS-433 does not appear on NARA's digitized deck-log index (archives.gov navy-online page searched 2026-10-04; ~19 numbered YMS hulls listed, YMS-433 absent), so the logs are an undigitized archival lead only. Entry verified programmatically on p. 121 of the typeset ship-number PDF (pdftotext -layout extraction): 'YMS-433 2/13/1945 6/30/1945'. The absence of any post-June-1945 coverage for a hull in service until August 1946 is an inventory fact not explained by the source.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-01
-
[3]NavSource Online: Mine Warfare Vessel Photo Archive, YMS-433 page (build/disposal chronology compiled from Navy Register data; specifications block; 'no DANFS' statement) [other_primary]
- Locator
- YMS-433 chronology block and specifications block
- Finding type
- vessel_history
- Finding
- YMS-1 Class Auxiliary Motor Minesweeper (call sign Nan-Queen-Sugar-Xray): laid down 7 June 1944 by the Tacoma Boatbuilding Co., Tacoma, WA; launched 30 September 1944; completed 13 February 1945; struck from the Naval Register 28 August 1946; transferred to the State Department, Foreign Liquidation Commission in April 1947 and sold; 'Fate unknown.' Spec block: displacement 270 t.; length 136'; beam 24' 6"; draft 8'; speed 15 kts.; complement 32; 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. No commanding officer is listed; no photograph is available. Page states: 'There is no DANFS History currently available for YMS-433.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1944-1947
- Population
- Tacoma Boatbuilding construction trades (1944-45); YMS-433 crew (1945-46); FLC/foreign-transfer crews (1946-47)
- Limitations
- NavSource is a compiled secondary archive of official data, not the underlying registers; the FLC transfer and 'fate unknown' rest on this source alone among those located (shipbuildinghistory's 'To the Philippines 1946 as a patrol boat' is a related but differently-worded disposal claim - see gaps). No decommissioning date is given. Contains no asbestos information. Operational stations between completion and disposal are not listed - service detail is undocumented in located sources.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-02
-
[4]NHHC, 'United States Pacific Fleet Organization, 1 May 1945' (official CINCPOA fleet organization roster, Navy Department Library Online Reading Room) [other_primary]
- Locator
- Pacific Fleet Organization 1 May 1945, Mine Squadron TWENTY YMS block: 'YMS 433 | (1) | ..........' (immediately after the YMS 432 row 'Lt. R. W. Crippin (USNR)')
- Finding type
- vessel_history
- Finding
- The official 1 May 1945 Pacific Fleet organization roster lists 'YMS 433' in the YMS block under Mine Squadron TWENTY (Capt. R. A. Larkin), within the forces of Commander Minecraft, Pacific Fleet (Rear Admiral A. Sharp) - the same squadron as sister YMS-432. YMS-433's row carries the (1) footnote marker and the no-name marker ('..........') in the commanding-officer column, and no division number in the pre-name column. This is the only unit-assignment documentation located between commissioning (13 Feb 1945) and disposal.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-05-01 (roster date)
- Population
- YMS-433 crew; Mine Squadron 20 minecraft population (1 May 1945)
- Limitations
- Establishes fleet assignment on the roster date, not stations or operations - where in the Pacific she was based or sweeping on 1 May 1945 is not stated. The (1) footnote's legend and the pre-name column's division numbering were not resolved in the document; their presence on this hull's row is recorded, not interpreted. Row verified live on the canonical NHHC page 2026-10-04 (UA-blocked 404s seen earlier in session were transient; the HyperWar/ibiblio transcription shows identical content). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-03
-
[5]Navy and Marine Corps Awards Manual, NAVPERS 15,790 (Rev. 1953), Part IV, Section 2, sub-section 16 - 'List of Ships and Units eligible for Engagement Stars' (HyperWar/ibiblio transcription of the official manual) [other_primary]
- Locator
- Awards-IV-16.html, Part IV ship list, YMS block: 'YMS 433: 4 Sep 45 - 8 Sep 45 | P207; 11 Sep 45 - 14 Sep 45 | P207'
- Finding type
- vessel_history
- Finding
- The official awards manual's per-ship engagement-star list credits 'YMS 433' with two qualifying windows under code P207, 'Minesweeping Operations Pacific': 4 Sep 45 - 8 Sep 45 and 11 Sep 45 - 14 Sep 45. The bare P207 code - without a sub-operation suffix (P207-1 Tsugaru Straits through P207-28 Yangtze River Approaches) - denotes participation in the general Pacific minesweeping window (23 Jun 45 - 2 Mar 46) rather than a named sub-location; only 1 star was authorized for participation in one or more P207 operations. This is the only operation-specific ship record located: the hull was sweeping mines in Pacific waters in the weeks immediately following the Japanese surrender (2 September 1945).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-09-04 to 1945-09-14 (qualifying windows); manual published 1953
- Population
- YMS-433 crew (September 1945 minesweeping period)
- Limitations
- Documents engagement-star qualifying windows, not which sweep area she worked - the bare P207 credit does not assign a named sub-location, and no station, port, or task-unit record was located. The source is an awards-eligibility list, not an operations log; dates describe qualifying participation windows. An independent transcription of the same NAVPERS 15,790 ship table (officialmilitaryribbons.com, commercial reseller - not cited per source policy) shows identical dates. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-04
-
[6]NHHC, 'Typhoons and Hurricanes: Pacific Typhoon at Okinawa, October 1945' - extract on Typhoon Louise from the Commander in Chief, Pacific Fleet and Pacific Ocean Areas report on the Surrender and Occupation of Japan (Annex A narrative; Appendix III damage listing, progress reports to 19 November) [other_primary]
- Locator
- NHHC page, Appendix III table - 18 unique YMS hulls searched (86, 90, 99, 146, 148, 151, 193, 275, 292, 308, 348, 381, 383, 384, 424, 442, 454, 590); 'YMS 433' absent
- Finding type
- vessel_history
- Finding
- The official CINCPOA report's Appendix III ('Typhoon Damage at Okinawa. Based Upon Progress Reports to 19 November') names 18 YMS hulls among the typhoon casualties of 9 October 1945 - including Mine Squadron TWENTY roster-mate YMS 424 ('Grounded - Beyond economical salvage'). YMS-433 does NOT appear anywhere in the damage listing: she was not a recorded casualty of Typhoon Louise at Okinawa.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1945-10-09 (event date); report compiled November 1945
- Population
- YMS-433 crew (October 1945)
- Limitations
- Absence from a damage appendix establishes only that she was not a recorded typhoon casualty - it does not establish where she was on 9 October 1945 (not every squadron hull was at Okinawa; her station that day is undocumented in located sources). The undigitized deck logs (SL44 coverage ends 6/30/1945, before the event) do not resolve it. Appendix III verified live on the canonical NHHC page 2026-10-04 (UA-blocked 404s seen earlier in session were transient). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-05
-
[7]uboat.net Allied Warships, USS YMS-433 (YMS-433) page - build/disposal data table [other_primary]
- Locator
- uboat.net ship/9852 data table and History lines
- Finding type
- vessel_history
- Finding
- Minesweeper of the YMS class: built by Tacoma Boat Building Co. (Tacoma, Washington); ordered 25 July 1943; laid down 7 June 1944; launched 30 September 1944; commissioned 13 February 1945; 'Stricken on 28 August 1946. Sold in April 1947.' No commands listed.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-1947
- Population
- YMS-433 crew (1945-46)
- Limitations
- uboat.net is a compiled secondary database, not a primary registry; its data corroborates NavSource on all shared milestones. 'Sold in April 1947' is the same FLC disposal event NavSource phrases as 'transferred to the State Department, Foreign Liquidation Commission in April 1947 and sold.' The 'ordered 25 July 1943' date rests on this source alone - not verified against a contract record. Contains no asbestos information.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-06
-
[8]shipbuildinghistory.com (Tim Colton), 'Tacoma Boat, Tacoma WA' yard page - history paragraph and hull table [other_primary]
- Locator
- tacoma.htm yard history paragraph; hull table row 'YMS 433'
- Finding type
- vessel_history
- Finding
- The Tacoma Boatbuilding yard table carries this hull: 'YMS 433 - US Navy - Minesweeper - 278 [GT] - 136 [ft] - 13-Feb-45 [delivery] - To the Philippines 1946 as a patrol boat' - corroborating builder and completion/delivery date, and carrying the only located statement of post-Navy disposition (Philippine patrol-boat service, 1946). Yard history: 'Tacoma Boatbuilding Company was established in 1926 and built many boats in WWII. It grew rapidly in the 70s and early 80s but got into difficulty with several large government contracts and filed for Chapter 11 protection in 1985. It emerged from bankruptcy in 1986 but could not recover and closed in 1992. The facility, which was at 1840 Marine View Drive, was liquidated in 1998.'
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1944-1947 (hull); yard history to 1998
- Population
- Tacoma Boatbuilding construction workforce (1944-45); reported Philippine patrol-boat crews (1946-?)
- Limitations
- Secondary compiled yard table, not a contract or transfer record; the table's 278 is a gross-tonnage figure - distinct from NavSource's 270-ton displacement, not a conflict. 'To the Philippines 1946 as a patrol boat' is consistent with FLC surplus-disposal practice (the 11 September 1946 U.S.-Philippine surplus-property agreement, ratified as Philippine Republic Act No. 33) but no Philippine name, pennant, operator, or service record is documented for this hull in located sources - the claim rests on this table alone. Contains no asbestos, insulation, or material-spec information for this hull or the yard's wartime output.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-07
-
[9]NavSource Online, Auxiliary Motor Minesweeper (YMS) index page - class description [other_primary]
- Locator
- YMS index class-description paragraphs
- Finding type
- vessel_history
- Finding
- The YMS type was a wood-hulled, diesel-powered inshore minesweeper designed by Henry B. Nevins, Inc. (YMS-1 laid down 4 March 1941 at City Island, NY); 561 were built at 35 yacht yards - 12 East Coast, 19 West Coast, 4 Great Lakes - with 481 completed. YMS-135 through YMS-445 (plus 480-481) were the single-stack variant, which includes YMS-433. The index records the class loss context: 'One of their greatest losses being on 9 October 1945, when seven U.S. YMS' were sunk in a typhoon off Okinawa.' Surviving YMSs still in naval service were reclassified AMS and named in 1947 - YMS-433, stricken 28 August 1946 and already leaving naval custody, was not among them and received no AMS designation or name.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1941-1969
- Population
- YMS-class crews and builders, 1941-1969 (class context)
- Limitations
- Class-level design and loss context only: establishes wood hull and diesel propulsion (no boilers, no steam piping - the dominant asbestos-lagging pathway of steam ships is absent by design), but documents no asbestos or insulation material content for the class or this hull. Does not establish presence or absence of residual asbestos components (gaskets, wiring, brake linings).
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-08
-
[10]Era inference built on: NavSource YMS index class description (wood hull, diesel plant); GAO HRD-80-2 program documentation (ev-10); NavSource/uboat.net/shipbuildinghistory build records (Tacoma Boatbuilding Co., 1944-45) [other_primary]
- Locator
- NavSource YMS index class description; GAO HRD-80-2; NavSource 11/19433.htm; uboat.net ship/9852; shipbuildinghistory tacoma.htm
- Finding type
- asbestos_application
- Finding
- A wooden-hulled diesel yard minesweeper built 1944-45 sits inside the Navy's documented asbestos-use era; era-standard applications aboard a small diesel craft of this type were diesel-exhaust lagging, machinery gaskets, valve packing, electrical insulation, and winch/windlass brake linings in confined below-deck spaces. As a diesel vessel she carried no steam plant - the boiler/turbine lagging pathway of steam vessels does not apply, and the wooden hull means no hull-insulation pathway of steel combatants; residual exposure pathways are machinery-space and maintenance-disturbance.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1944-1947
- Population
- Tacoma Boatbuilding construction trades (1944-45); crew (1945-46); disposal/transfer crews (1946-47); reported Philippine service
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, construction specification, or work package located for YMS-433. Names era-standard applications, not confirmed installed materials. No quantity. Product names are normalized era terms; no manufacturer attribution for this hull. The 1946-47 FLC disposal and reported Philippine patrol-boat service are undocumented material events - no work or survey record located at any custody change.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-09
-
[11]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2
- 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 (1944-45) and naval service era (1945-46).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1979
- Population
- Navy shipyard workers and ships' crews; asbestos program review
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. Full text not retrieved this session (gao.gov returned HTTP 403 to automated fetch, standing defect since Batch-01); the product page is cited and the report's ship-level scope is program-wide.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-10
-
[12]Batch-9074 search ledger (this record): NARA Special List 44 + digitized-log index; NavSource (hull page + class index); CINCPOA 1 May 1945 fleet organization roster (NHHC, verified live; HyperWar transcription cross-checked); NAVPERS 15,790 engagement-star list (HyperWar transcription); NHHC CINCPOA typhoon report page (verified live); NHHC/DANFS; Naval Vessel Register; uboat.net; shipbuildinghistory yard table; Atlas shipyards.json; Wikipedia; CourtListener opinion and docket search [other_primary]
- Locator
- search_ledger rows sl-uss-yms-433-01 through sl-uss-yms-433-17
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or environmental assessment naming USS YMS-433 was found in the public sources searched; no DANFS entry exists (NavSource states none; NHHC DANFS URLs return 404); no NVR detail page exists (vessel stricken 1946, outside NVR coverage; SHIPDETAILS URL redirects to the NVR root); the deck logs themselves are undigitized; no qualifying litigation naming the hull was located - CourtListener base queries run through the authenticated helper under fleet pacing returned zero opinion hits for 'USS YMS-433' (final status of all four queries in search_ledger rows sl-uss-yms-433-14 through -17).
- 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 - WWII-era diesel auxiliaries still carried asbestos in some components (gaskets, electrical insulation, brake linings); it establishes only that nothing ship-specific is published. The hull's material fate after the April 1947 FLC sale is unrecorded - she received no material or environmental survey in located records at striking (1946), FLC transfer (1947), or reported Philippine service; 'fate unknown' (NavSource).
- Atlas source
- true
- Evidence ID
- ev-uss-yms-433-11