Evidence
13 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-13).
-
[1]research packet 936-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: PHANTOM
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Evidence ID
- uss-pc-764-pc764-pkt-936-packet-md
-
[2]NARA, RG 24 'Muster Rolls of U.S. Navy Ships, Stations, and Other Naval Activities' - file unit 'SC-764, 10/30/42-12/30/42' (NAID 192200402, Roll 6883; 22 digitized images, Ancestry scan) [other_primary]
- Locator
- NAID 192200402, images 4 (commissioning cover) and 19 (recapitulation sheet) of 22
- Finding type
- vessel_history
- Finding
- Primary Navy personnel record for this hull: the commissioning muster roll cover is styled 'MUSTER ROLL OF THE CREW OF THE U.S.S. SC - 764' dated 'the 30th day of October, 1942' and forwarded 2 November 1942 from Ipswich, Massachusetts - the builder's yard location. The file unit's stated coverage is 10/30/42-12/30/42, the entire U.S. commission. The recapitulation sheet is annotated 'SC764 (Decommissioning - Dec. 30, 1942)' and summarizes 18 enlisted brought forward, 6 gains, 1 loss, 23 remaining on board and carried forward, against an operating allowance of 24.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-10-30 to 1942-12-30
- Population
- US Navy crew of SC-764, Oct 30 - Dec 30 1942 (~23-24 enlisted plus officers)
- Limitations
- Establishes commissioning date, the SC-764 styling at commissioning, U.S. decommissioning on 30 December 1942, and approximate enlisted headcount. Personnel names/rates are in the roll but were not transcribed. A muster roll is not a deck log - it records personnel status, not operations. No asbestos or material content. Roll styling (SC-764) conflicts with NavSource's 'commissioned PC-764' claim - see ev-07.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-01
-
[3]DANFS Vol. VI (Naval History Division, Navy Dept.), Appendix I 'Submarine Chasers (SC)' - SC-764 entry (printed p. 733) and SC-497 class characteristics; Internet Archive scan of the official publication [nhhc_danfs]
- Locator
- DANFS Vol. VI, Appendix I 'Submarine Chasers (SC)', SC-764 entry (printed p. 733) and class-characteristics block
- Finding type
- vessel_history
- Finding
- Printed DANFS entry for this hull: 'SC-764 - Built at W. A. Robinson Inc., Ipswich, Mass. Keel laid 4/3/42. Launched 10/12/42. Commissioned 10/30/42. Transferred to Brazil 12/31/44.' The same appendix prints the SC-497 class characteristics: 110'0" overall, 17'0" beam, 6'6" max draft (full load), 148 t full-load displacement, accommodations 3 officers + 25 enlisted, 2 diesel engines (1540 or 800 hp) on 2 screws, designed speed 21.0 or 15.6 knots; the printed SC-497 class-number grouping (497-508, 511-522, 524-541, 628-775, 977-1076, 1266-1375, 1474-1493, 1496-1499, 1502-1508, 1510-1512) includes hull 764.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942
- Population
- Builder yard trades (W. A. Robinson, Ipswich, Apr-Oct 1942); US Navy crew (Oct-Dec 1942)
- Limitations
- Official Navy publication, one-line appendix entry. The printed transfer year '12/31/44' contradicts the NARA decommissioning record (12/30/1942), the Brazilian Navy command date (30-12-1942), and NavSource/uboat.net (31 December 1942) - assessed as a typographical error, see ev-06. Entry says nothing about the PC-764 designation NavSource reports, and nothing about asbestos. Live NHHC online DANFS has no SC-764 or PC-764 page (404 confirmed 2026-10-03); citation is the Internet Archive scan of the official printed volume.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-02
-
[4]Revista Marítima Brasileira (Brazilian Navy official journal), 'O Brasil declara guerra ao Eixo: 70 anos' by Luiz Edmundo Brígido Bittencourt, v. 132 n. 04/06 (2012), pp. 34-58 [other_primary]
- Locator
- Revista Marítima Brasileira v.132 n.04/06 (2012), article view 6868, caça-pau roster and per-boat statistics table
- Finding type
- vessel_history
- Finding
- Brazilian Navy official journal documents this hull's transfer: in a roster of the eight 110-foot wooden submarine chasers ('caça-pau') received between December 1942 and April 1943, the entry 'SC 764-Juruá - 30-12-1942 - Luiz Penido Burnier' gives the Brazilian command-assumption/officer-assignment date of 30 December 1942 and the Brazilian name Juruá. The article names the eight boats - Javarí, Jutaí, Juruá, Juruena, Jaguarão, Jaguaribe, Jacuí and Jundiaí - as the 110-foot wood-hulled additions to Brazil's antisubmarine force, and gives Juruá's wartime service figure of 64,200 (context: per-boat mileage table).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1948 (Brazilian service era covered)
- Population
- Brazilian Navy crew of Juruá (CS 53), Dec 1942 onward
- Limitations
- Official Brazilian Navy periodical - authoritative on the Brazilian side. The 30-12-1942 date is the Brazilian command/assignment date; US sources give the formal transfer as 31 December 1942. The per-boat figures table is partially OCR-fragmented in extraction - the mileage figure (64,200) is carried in prose as approximate secondary detail; the name, ex-hull mapping, and date are unambiguous. No asbestos content. Direct PDF URL returned 403 to plain curl; article landing page and PDF content verified via Firecrawl 2026-10-03.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-03
-
[5]NavSource Online: Submarine Chaser Photo Archive, 'SC-764 ex-PC-764' (page 12/150764.htm; page created by Gary P. Priolo, maintained by Tom Bateman) [other_primary]
- Locator
- NavSource 12/150764.htm, chronology block and specifications block
- Finding type
- vessel_history
- Finding
- NavSource's chronology for this hull: laid down 3 April 1942 by W. A. Robinson, Inc., Ipswich, MA; launched 12 October 1942; 'Commissioned USS PC-764, 30 October 1942'; 'Transferred to Brazil 31 December 1942 and named Juruá (CS 53)'; 'Reclassified SC-764 by the U.S. Navy in April 1943'; 'Reclassified J-3 after World War II'; decommissioned 23 September 1948; fate unknown. Header treats the vessel as one hull: 'SC-764 ex-PC-764 - served the Navies of the United States and Brazil.' Specifications: 148 t, 110'10", 17' beam, 6'6" draft, 15.6 kts, complement 28, two 880-bhp GM 8-268A diesels, single reduction gear, two shafts; one 3"/23, two 20mm, Mousetrap and K-Gun depth-charge projectors, two depth-charge tracks.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1951
- Population
- US crew (Oct-Dec 1942); Brazilian crew (1942-48)
- Limitations
- Volunteer secondary compilation, not a primary registry. Its 'commissioned USS PC-764' assertion conflicts with the NARA commissioning muster roll styled 'U.S.S. SC-764' (ev-01) - carried as a documented designation variant, not resolved. The 'reclassified SC-764 April 1943' and 'J-3 post-WWII' items are uncorroborated elsewhere. No asbestos content. Page verified live 2026-10-03.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-04
-
[6]uboat.net Allied Warships, 'USS SC-764 (SC-764)' and linked 'BZ Jurui (CS 53)' entries; corroborated by Sixtant.net 'Sub Chaser Juruá CS 53 J3' page (Brazilian Northeast Naval Force series) [other_primary]
- Locator
- uboat.net ship/8981.html and ship/10106.html; sixtant.net '14)SUB CHASER JURUA CS 53 J3' page
- Finding type
- vessel_history
- Finding
- Secondary databases corroborate the transfer and Brazilian identity: uboat.net lists 'USS SC-764' of the SC-497 class, built W.A. Robinson Inc., laid down 3 Apr 1942, launched 12 Oct 1942, commissioned 30 Oct 1942, 'Transferred to Brazil on 31 December 1942 being renamed Jurui,' with the linked Brazilian entry 'BZ Jurui (CS 53)', commissioned 31 Dec 1942, former name USS PC-764. Sixtant's Juruá page (drawing on SDGM - the Brazilian Navy's General Documentation Service - photography) repeats the construction/transfer timeline and adds Brazilian service figures: 'Juruá patrolled 64,514 miles, in 247 days at sea and escorted 36 convoys' during WWII, stricken from active duty 23 September 1948, stricken from the Naval Register (1951), reclassified J-3.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1951
- Population
- Brazilian crew of Juruá (CS 53 / J-3), 1942-48
- Limitations
- Private research databases/sites - corroboration and leads only, not official sources. Brazilian-name spelling varies: Juruá (NavSource, Brazilian Navy journal, Sixtant) vs Jurui (uboat.net, Wikipedia). The 64,514-mile figure conflicts with the Brazilian journal's partially OCR'd 64,200 - neither is verified. Sixtant's 1951 Naval-Register strike is uncorroborated elsewhere (see gaps). No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-05
-
[7]Cross-source date audit: printed DANFS Vol. VI (SC-764 entry) vs NARA muster roll NAID 192200402 vs Revista Marítima Brasileira vs NavSource/uboat.net [nhhc_danfs]
- Locator
- DANFS Vol. VI Appendix I, SC-762 through SC-766 entries (p. 733); NAID 192200402 recapitulation sheet; Revista Marítima article 6868
- Finding type
- historical_record
- Finding
- CORRECTION: printed DANFS gives 'Transferred to Brazil 12/31/44' for SC-764. This is a typographical error - the hull could not have transferred in December 1944: NARA's muster roll records her U.S. Navy 'Decommissioning - Dec. 30, 1942'; the Brazilian Navy journal records 'SC 764-Juruá - 30-12-1942' among boats received Dec 1942-Apr 1943; and NavSource, uboat.net, and Sixtant all print '31 December 1942.' The correct transfer window is 30-31 December 1942 (U.S. decommission 30 Dec; Brazilian command assumption 30 Dec; formal transfer recorded 31 Dec). The same DANFS appendix prints transfer dates of 12/31/42 (SC-762), 12/7/42 (SC-763), 2/16/43 (SC-765), and 12/31/42 (SC-766) for the sister hulls of the same Brazilian transfer group.
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942
- Limitations
- Corrects a date typo in an official printed source; does not add exposure information. Day-level differences between sources (30 vs 31 Dec 1942) reflect U.S. decommissioning vs formal transfer vs Brazilian command assumption - all within 48 hours, recorded individually rather than harmonized.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-06
-
[8]Designation cross-check: NARA commissioning muster roll ('U.S.S. SC-764', 30 Oct 1942) vs NavSource designation history ('Commissioned USS PC-764' / 'Reclassified SC-764 ... April 1943') [other_primary]
- Locator
- NAID 192200402 image 4 (commissioning cover 'U.S.S. SC - 764'); NavSource 12/150764.htm chronology
- Finding type
- historical_record
- Finding
- CORRECTION/VARIANT: NavSource asserts the hull was 'Commissioned USS PC-764' and 'Reclassified SC-764 by the U.S. Navy in April 1943' (its 'ex-PC-764' header derives from this). The contemporaneous primary record - the Bureau of Naval Personnel commissioning muster roll, signed at Ipswich and forwarded 2 November 1942 - styles the ship 'U.S.S. SC-764' at commissioning on 30 October 1942. Both designations thus attach to the same hull in the record; the muster-roll styling is treated as controlling for the commissioning designation, and NavSource's PC-764 sequence is preserved as a documented variant (a PC-764 designation may have existed on paper during lend-lease earmarking or in a pre-commissioning assignment, but no primary record of an actual PC-764 commissioning was located).
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1943
- Limitations
- Resolves canonical identity (SC-764) on primary evidence while preserving the PC-764 variant documented by NavSource - the reason this record's file slug carries both designations. The April 1943 'reclassification' NavSource describes may reflect administrative redesignation while in Brazilian service rather than a physical change. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-07
-
[9]NARA Catalog full-text index hits for 'SC-764' inside digitized WWII war diaries (RG microfilm WWII War Diaries series) [other_primary]
- Locator
- NARA Catalog search 'SC-764' - file units NAID 134011604, 134007305, 78218132, 134038251
- Finding type
- historical_record
- Finding
- NARA Catalog full-text search returns 'SC-764' inside several November-December 1942 command war diaries: 'COMINSHPAT 3rd ND - War Diary, Ambrose Section, 11/1-30/42' (NAID 134011604), 'NAV BASE, CAPE MAY - War Diaries, November, 1942' (NAID 134007305), 'COMEASTSEAFRON - War Diary, 11/1/42 to 12/31/42' (NAID 78218132), and 'COMGULFSEAFRON - War Diary, 12/1-31/42' (NAID 134038251). The pattern is consistent with a November-December 1942 transit down the U.S. East Coast into Gulf/Caribbean waters en route to Brazil.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-11 to 1942-12
- Population
- US crew during Nov-Dec 1942 transit
- Limitations
- Archival lead only: catalog index hits establish that 'SC-764' appears in these diaries' OCR'd text; page-level content (what the diaries record about her) was not reviewed this session. Index also returns name collisions (a CIA subject file, an Army roster, a Fort Myer photo ID '111-SC-764') - only the dated command diaries match this hull's service window. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-08
-
[10]Patrol Craft Sailors Association, 'Information on WWII SCs' - 110-foot wood-hull subchaser program data (438 delivered of 475 ordered; 142 lend-leased including 8 to Brazil; class specifications) [other_primary]
- Locator
- ww2pcsa.org/subchaser.html - program table, lend-lease table, specs block
- Finding type
- vessel_history
- Finding
- Class-program context for the SC-497 type: 475 ordered, 37 cancelled, 438 delivered at ~$500,000 each; 142 lend-leased (78 USSR, 50 France, 8 Brazil, 3 Norway, 3 Mexico) - the 8-hull Brazilian group includes this hull. PCSA class specs: 110'10" length, 17'11.5" beam, 98 tons, two 1,200-bhp straight-8s or two GM pancake diesels, 19 knots, 3 officers + 25 enlisted, 3"/23 main battery (later 40mm Bofors), .50-cal/20mm secondary, K-guns and Mousetrap racks.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1944
- Population
- SC-497-class crews and builders (1941-44 program-wide)
- Limitations
- Veterans' association compilation - program context only, not a hull record and not a government source. The 98-ton figure is light/design displacement vs DANFS's 148 t full-load; both are class figures, neither is hull-weighed. The '8 to Brazil' count is corroborated by the Brazilian Navy journal's own eight-boat roster. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-09
-
[11]Era inference built on: DANFS Vol. VI Appendix I class characteristics (110' wooden hull, 2 diesel engines, no steam plant listed); NavSource specifications (two GM 8-268A diesels); GAO HRD-80-2 Navy-wide asbestos-use-era documentation (ev-11) [other_primary]
- Locator
- DANFS Vol. VI Appendix I class-characteristics block; NavSource 12/150764.htm specs; GAO HRD-80-2 product page
- Finding type
- asbestos_application
- Finding
- A wooden-hulled 110-foot diesel-powered submarine chaser built in 1942 sits inside the Navy's documented asbestos-use era, but the asbestos-relevant system inventory is narrow: no boilers, no steam lines, no turbine plant - propulsion is two GM 8-268A diesel engines. Era-standard applications aboard a vessel of this type and period would be machinery and diesel-exhaust lagging, gaskets, valve packing, and electrical insulation, plus possible insulation/cement products in small machinery and accommodation spaces. As a small wooden combatant her asbestos footprint - if any - was far smaller than steam-driven contemporaries.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1942-1948
- Population
- W. A. Robinson yard trades (Apr-Oct 1942); US crew (Oct-Dec 1942); Brazilian crew (1942-48); unknown disposal workers
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, work package, or builder specification located. No asbestos product is confirmed installed aboard this hull. Names era-standard applications as research leads, not proven materials. No quantity. Small-craft wooden-boat asbestos documentation is thinner than for steam combatants - the honest record is 'not documented,' not 'present.'
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-10
-
[12]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 1942 construction and both U.S. and Brazilian service eras.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- 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 2026-10-03) - content via product-page description, same standing defect as prior batches.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-11
-
[13]Batch-8137 search ledger (this record): NARA muster roll + catalog full-text index; printed DANFS Vol. VI (Internet Archive); NHHC online DANFS (404 both designations); NavSource; Brazilian Navy Revista Marítima Brasileira; uboat.net; Sixtant; PCSA; GAO product page; CourtListener (blocked - fleet pacing); secondary web sweep [other_primary]
- Locator
- search_ledger rows sl-uss-pc-764-pc764-01 through -12
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or verified litigation naming USS SC-764, PC-764, or Juruá (CS 53/J-3) was found in the public sources searched. CAVEAT: CourtListener could not be queried this session - the helper script returned the fleet-pacing stand-down on every attempt (shared ~58/hr budget spent); logged as blocked in search_ledger, not as a negative result. Secondary web sweeps surfaced no qualifying case and no ship-specific asbestos claims beyond listicle-style content.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 2026-10-03
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - and the litigation repository search is a genuine open gap (blocked, not run). Brazilian-language archival records for her 1942-48 service and disposal were not searched and are the likeliest remaining lead. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-764-pc764-12