Evidence
8 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-8).
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[1]research packet 373-packet.md (1 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: Queue: USS IX-506 (placeholder name; hull IX-506) → VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-ix-506-ix506-pkt-373-packet-md
-
[2]NavSource Naval History, Amphibious Photo Archive, IX-506 ex YFU-82 (service chronology, Vietnam campaign table, awards, specifications, crew-contributed photographs) [other_primary]
- Locator
- IX-506 ex YFU-82 page (navsource.net/archives/14/18082.htm): chronology list, Vietnam campaign table, specifications block; photo captions by crew member John Grothouse SN
- Finding type
- vessel_history
- Finding
- Identity chain and service history: built as YFU-82 (YFU-71 class, 'Skilak cargo craft') by Pacific Coast Engineering Co., Alameda CA (yard no. 241); laid down 1968-06-15, launched 1968-08-23, delivered 1968-10-04. Vietnam service at Naval Support Activity/Naval Support Facility Da Nang with seven credited campaign periods (Vietnamese Counteroffensive Phase VI; Tet/69 Counteroffensive; Vietnam Summer-Fall 1969; Vietnam Winter-Spring 1970; Sanctuary Counteroffensive; Vietnamese Counteroffensive Phase VII; Consolidation I). Transferred to U.S. Army custody circa spring 1970; returned to U.S. Navy 1973. Reclassified Miscellaneous Unclassified IX-506 at Naval Station Long Beach 1978-04-01. Reported supporting SOAR (Southern California ASW Range) out of NOSC San Diego from Apr 1985; mission curtailed by an engine-room fire; bore unofficial name Sea Lion; placed out of service at an unrecorded date; stricken 1997-08-21; sold by DRMS 1999-06-14; reported to have gone to the Marshall Islands government as a cargo vessel; final fate unknown. Specs: 220/380 t, 125 x 36 x 6 ft, 9 kt, 3 x .50 cal MG, complement 1 CPO + 11 enlisted, 2 Detroit Diesel 471-series engines with 115 kW 185 A generators, twin shafts.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-29
- Study period
- 1968-1999
- Population
- Navy and Army harbor-craft crews (Da Nang 1968-1973); NOSC range-support crews (1978-ca.1985)
- Limitations
- NavSource is a volunteer-compiled photo/history archive, not an official record - it is treated here as the primary-organizing secondary source because the official sources (DANFS, NVR) carry no narrative for this hull. Individual data points (Army custody dates, SOAR period, fire, Sea Lion name, Marshall Islands disposition) are stated without primary citations; the Marshall Islands report is explicitly tentative ('appears to have gone'). Contains no asbestos or materials information whatsoever.
- Atlas source
- true
- Evidence ID
- ev-uss-ix-506-01
-
[3]Naval Vessel Register (NAVSEA), US Navy Hulls in a 'Non Active' status - N list: IX 506 row (Wayback capture 2016-09-27) [other_primary]
- Locator
- NVR 'Non Active - N' table, IX 506 row
- Finding type
- vessel_history
- Finding
- The official Naval Vessel Register lists hull 'IX 506' (name field: NO NAME) with status date 06/14/1999 and disposition 'Disposed of, sold by Defense Reutilization and Marketing Service (DRMS) for reuse/conversion' - confirming the hull's identity on the official inventory and its disposal event.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-09-29
- Study period
- 1999
- Limitations
- Records the disposal event only; does not document construction, service periods, the 1997 strike date, materials, or any hazmat condition of the sold craft. Live nvr.navy.mil per-hull detail page not retrievable (frameset, craft disposed pre-digital NVR era) - Wayback capture of the official list used instead.
- Atlas source
- true
- Evidence ID
- ev-uss-ix-506-02
-
[4]Shipscribe (S.S. Roberts), 'Other U.S. Navy Self-Propelled Service Craft, 1946-1980' - YFU program history compiled from Navy service-craft lists [other_primary]
- Locator
- YY003.html, 'Harbor Utility Craft (YFU...)' section narrative and YFU-82 photo caption
- Finding type
- vessel_history
- Finding
- YFU program documentation: the YFU classification was added 11 Oct 1957; the Navy reclassified 70 LCUs to YFUs between 1958 and 1966; on 20 Oct 1966 it contracted for six new-construction YFUs (YFU 71-76) and on 1 Jun 1967 for six more (YFU 77-82) - the 'Skilak cargo craft,' the only purpose-built units of the type. Confirms 'YFU-82 became IX-506 as a range support vessel on 1 Apr 1978.'
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-29
- Study period
- 1957-1978
- Population
- Vietnam-era harbor-craft program context
- Limitations
- Program-level compilation (secondary, though built on official service-craft lists) - establishes the contract cohort and reclassification, not this hull's materials or condition. No asbestos information.
- Atlas source
- true
- Evidence ID
- ev-uss-ix-506-03
-
[5]GlobalSecurity.org, Southern California Offshore Range (SCORE) page describing the SOAR sub-range (official program context for the craft's 1985 range-support role) [reputable_press]
- Locator
- SCORE page, 'Southern California ASW Range (SOAR)' subsection
- Finding type
- vessel_history
- Finding
- Mission context for the IX-506 period: the Southern California ASW Range (SOAR) comprised seven sub-areas totaling ~670 sq mi of 3-D underwater tracking area 68 nm off San Diego, supporting Pacific Fleet ASW exercises including unit-level torpedo firing - the documented role of this craft out of NOSC San Diego from Apr 1985 until the engine-room fire curtailed her mission.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-09-29
- Study period
- 1978-ca.1985
- Population
- NOSC range crews and exercised fleet units (context)
- Limitations
- Establishes what the range was and why a support craft was assigned; does not detail this hull's specific range duties, post-fire repair, or materials. GlobalSecurity is a reputable secondary defense reference; the craft-to-range linkage itself is from NavSource.
- Atlas source
- true
- Evidence ID
- ev-uss-ix-506-04
-
[6]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) - program-level documentation of Navy asbestos use and protection policies in the era this craft was built [gao]
- Locator
- GAO product page HRD-80-2; propulsion facts per NavSource specifications block
- Finding type
- asbestos_application
- Finding
- Era inference only: this craft was built in 1968, inside the period when the Navy used asbestos-containing materials extensively in ship and service-craft construction and repair, a documented Navy-wide condition that GAO addressed at program level. For this hull type the inference is weaker than for steam vessels - a 125-ft diesel-powered harbor lighter had no boilers, turbines, or steam piping; plausible era-typical applications are limited to exhaust/thermal lagging, machinery gaskets and packing, deck coverings/tile, and winch brake linings.
- Verification
- inferred
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-09-29
- Study period
- 1968
- Population
- Construction trades (Pacific Coast Engineering, 1968); Navy/Army crews
- Limitations
- INFERENCE, not documentation: no materials specification, survey, or abatement record exists for the YFU-71 class or this hull, and the diesel-mechanical plant makes the standard steam-era exposure pattern inapplicable. GAO report covers shipyard-worker protection, not craft composition. Does not establish asbestos was aboard, in what products, or in what quantity. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403) - product-page description used.
- Atlas source
- true
- Evidence ID
- ev-uss-ix-506-05
-
[7]Batch-4817 search ledger (this record): NavSource, NVR (Wayback), Shipscribe, NHHC/DANFS check, Wikipedia yard-craft list, GlobalSecurity SCORE, DTIC SOAR docs, CourtListener sweeps [other_primary]
- Locator
- search_ledger rows sl-uss-ix-506-01 through sl-uss-ix-506-11
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, materials specification, crew exposure account, or docketed case naming IX-506, YFU-82, or the unofficial name Sea Lion was found in the public sources searched (see search_ledger).
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-09-29
- Study period
- 2026-09-29
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - the craft's 1968 construction and post-fire repair history are consistent with retained era materials, but nothing documents them. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-ix-506-06
-
[8]CourtListener API v4 sweep (opinion index type=o and RECAP dockets type=r) for hull numbers 'IX-506' / 'YFU-82' and unofficial name 'Sea Lion' via cl-auth-search.py (authenticated, fleet-paced) [court_record]
- Locator
- search_ledger rows sl-uss-ix-506-06 through sl-uss-ix-506-10
- Finding type
- litigation_documented
- Finding
- CourtListener sweep executed under the authenticated fleet-paced helper (cl-auth-search.py), 2026-09-29: '"IX-506"' (type=o) = 0 hits; '"YFU-82"' (type=o) = 0 hits; '"Sea Lion" asbestos' (type=o) = 0 hits; '"YFU-82" OR "IX-506"' (type=r, RECAP dockets) = 2 hits, both classified name collision / not qualifying - Innovative Health LLC v. Biosense Webster, Inc. (C.D. Cal. 8:19-cv-01984, medical-device litigation; string match inside exhibits) and Doe A v. Whitmer (E.D. Mich. 2:22-cv-10209, sex-offender-registry civil-rights class action; string collision, unrelated to any vessel); '"Sea Lion" asbestos' (type=r) = 20 docket-level full-text hits, of which 19 are obvious non-maritime collisions (environmental, patent, bankruptcy, insurance, copyright, opiate-MDL dockets whose documents contain the strings 'sea lion' and 'asbestos' anywhere) and 1 is a genuine asbestos PI docket - THE ESTATE OF ROBERT J DION v. ANCHOR PACKING COMPANY (E.D. Pa. 2:10-cv-64681, MDL-875 member) whose Doc 79-1 (GE summary-judgment supplement) contains the string 'Sea Lion'; the document file is unavailable (RECAP storage 404) so the referent cannot be verified. ZERO qualifying asbestos litigation verifiably naming this hull under any designation.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-09-29
- Study period
- 2026-09-29
- Limitations
- Sweep coverage is the CourtListener index only - it does not cover state-court records, asbestos trust claims, or non-U.S. jurisdictions. The Dion 'Sea Lion' string match is a pleading-stage document in another plaintiff's case, unverifiable (file 404s) and near-certainly a different 'Sea Lion' - multiple merchant/fishing vessels carry that name and an unofficial Navy nickname is not a pleading convention; both hull-number queries returned zero. Classified name collision / not qualifying, logged down not up. Absence of indexed litigation does not prove no claim was ever filed.
- Atlas source
- true
- Evidence ID
- ev-uss-ix-506-07