USS Impeccable (AM-320)

Evidence

8 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-8).

1. [1]DANFS, Impeccable (AM-320) - verbatim transcription (specifications block plus full service narrative; live NHHC page returns 404 - transcription via historycentral.com mirror; postwar half corroborated by verbatim DANFS text at koreanwar.org and the NHHC Online Library summary) [nhhc_danfs]

   Locator

   DANFS entry, specifications block + full service narrative (historycentral.com verbatim mirror; koreanwar.org verbatim mirror for the Korea/postwar paragraphs)

   Finding type

   vessel_history

   Finding

   DANFS record for this hull: ordered for the Royal Navy under Lend-Lease as HMS Brutus (BAM-7); reclassified/renamed Impeccable (AM-320) 23 January 1943; laid down 1 February 1943; launched 21 May 1943 by General Engineering & Dry Dock Co., Alameda, Calif., sponsored by Mrs. Agnes W. Hanson; commissioned 24 April 1944 (DANFS gives the commanding officer's initials only and the mirrors garble them - 'H. H. Smith' at koreanwar.org, 'El. H. Smith' at historycentral.com; NavSource identifies LCDR Bryan Hooker Smith, Jr., USNR). Shakedown off California; sailed 3 July 1944 on Pacific escort duty; Pearl Harbor-Eniwetok to November; Palaus November-December 1944; patrol/escort out of Ulithi early 1945; departed 19 March 1945 for the Okinawa assault; arrived off the island 24 March sweeping approach and transport areas; air attack 28 March; screening duties from the 1 April assault; air attack at Kerama Retto 6 April; Hagushi beaches patrol and picket; 20 May alongside kamikaze-damaged USS Chase giving assistance; rescue duties for other damaged screening/escort ships; sailed 1 July for Guam; returned to Okinawa with resupply convoy, sailed again 16 August (day after the armistice), Okinawa 21 August; swept Wakayama approaches September and November 1945 in occupation support; departed Sasebo 20 November; San Francisco 15 December 1945; decommissioned at Terminal Island 27 March 1947. Recommissioned 12 March 1952; sailed 3 September for Sasebo; Wonsan naval siege and mine clearance; amphibious feint at Kojo 12-14 October exchanging fire with shore batteries; drove a sampan ashore off Hungnam 17 November 1952; fought Wonsan batteries 20 February 1953 while covering a minesweeping operation; Pearl Harbor 31 March, homeport Long Beach 10 April 1953; training/readiness off Mexico and the Canal Zone through 1953; minesweeping and fleet maneuvers through first half of 1955; reclassified MSF-320 7 February 1955; arrived Astoria, Oreg., 16 August 1955; decommissioned 14 October; Pacific Reserve Fleet Bremerton. Three battle stars WWII, two for Korea. (Transcriber note carried by koreanwar.org mirror: stricken 1 July 1972, disposed of by Navy sale 1 April 1974 - corroborated by NavSource.)

   Verification

   verified

   Role

   supporting

   Documentation level

   ship_specific

   Accessed

   2026-09-22

   Study period

   1943-1955; 1972-1974

   Population

   General Engineering & Dry Dock construction trades 1943-44; wartime and Korea-era crew (class design complement 105)

   Limitations

   DANFS documents identity, construction, and service history - not materials or asbestos content. Live NHHC DANFS page returned 404 on 2026-09-22; verbatim transcription mirrors cited (historycentral carries the full narrative including the WWII section; koreanwar.org carries an abridged text covering the Korea/postwar paragraphs). NavSource conflicts on the 1947 decommissioning location (San Diego vs DANFS Terminal Island) and NavalCoverMuseum on the commissioning day (29 vs 24 April) - carried in gaps. Wikipedia adds a 18 October 1952 Sondok engagement detail and names USS Condor (AMS-5) as the covered sweeper on 20 February 1953; neither is in the DANFS text and neither is carried.

   Atlas source

   true

   Evidence ID

   ev-uss-impeccable-am320-01

2. [2]NHHC Online Library of Selected Images, USS Impeccable (AM-320, later MSF-320), 1944-1974 (verbatim Naval Historical Center page mirrored at HyperWar/ibiblio, page dated 23 October 1999) [nhhc_danfs]

   Locator

   NHC Online Library page (HyperWar/ibiblio mirror), ship summary + photo caption 80-G-632291 + NARA holding list USN 1045919, USN 1045496

   Finding type

   historical_record

   Finding

   Naval Historical Center photo-archive page for this hull: summarizes the 890-ton Auk-class minesweeper built at Alameda, commissioned April 1944; escort and patrol duties in the Pacific; Okinawa campaign March-June 1945 enduring several Japanese air attacks on minesweeping, patrol and rescue missions; postwar mine clearance in Japanese waters and return December 1945; out of commission March 1947; active service March 1952; Korean War mine clearance and patrol September 1952-March 1953; U.S. Pacific coast operations; MSF-320 February 1955; decommissioned October 1955; reserve until sold for scrapping 1974. Catalogs NARA-held photo 80-G-632291 (USS Laertes AR-20 at Sasebo, Japan, 8 October 1952, with nine minesweepers and a harbor tug nested alongside - Impeccable, Gladiator AM-319, Shoveler AM-382, Defense AM-317 and Devastator AM-318 to the left; Condor AMS-5, Kite AMS-22, Curlew AMS-8, Chatterer AMS-40 and Wallacut YTB-420 to the right) and lists NARA-held views USN 1045919 and USN 1045496 (underway aerials, early 1950s, received by the Naval Photographic Center December 1959).

   Verification

   verified

   Role

   context

   Documentation level

   ship_specific

   Accessed

   2026-09-22

   Study period

   1944-1974

   Population

   Crew depicted October 1952 (Sasebo nest); NARA/NHC archival holdings

   Limitations

   Photo-catalog documentation of the hull and its service periods; contains no asbestos or materials information. The NHC summary compresses the DANFS chronology (e.g., 'out of commission from March 1947' without the Terminal Island site detail).

   Atlas source

   true

   Evidence ID

   ev-uss-impeccable-am320-02

3. [3]NavSource Online Mine Warfare Vessel Photo Archive, Impeccable (MSF-320) ex-USS Impeccable (AM-320), ex-HMS Brutus (BAM-7) [other_primary]

   Locator

   NavSource 11/02320 page - chronology, specifications block, CO roster, photo captions

   Finding type

   vessel_history

   Finding

   NavSource archive record for this hull adds detail not in DANFS: originally planned as HMS Brutus (BAM-7); reclassified/renamed Impeccable (AM-320) 23 January 1943; laid down 1 February 1943; launched 21 May 1943; call sign N-C-M-Z; Naval Vessel Register of 1 January 1949 lists the planned decommissioning/in-reserve date as August 1946 (a stale plan entry postdating the actual March 1947 decommissioning); decommissioned 27 March 1947 at San Diego (vs DANFS 'Terminal Island' - conflict carried in gaps); struck from the Naval Register 1 July 1972; sold for scrap 1 April 1974. Commanding officers: LCDR Bryan Hooker Smith, Jr., USNR (24 April 1944 - 8 March 1946); LT Robert Charles Burnett, USNR (8 March 1946 - 27 March 1947). Ship-specific propulsion block: two 1,988 shp Baldwin VO8 diesel-electric drive engines, Westinghouse single reduction gear, two shafts. Photo evidence: under-construction view dated 15 March 1944 at the Alameda yard (bow number 57; USS Pocatello PF-9 in frame; U.S. Navy photo).

   Verification

   verified

   Role

   supporting

   Documentation level

   ship_specific

   Accessed

   2026-09-22

   Study period

   1943-1974

   Population

   Crew 1944-1955 (CO roster listed); GE&DD yard workforce (1944 construction photo)

   Limitations

   NavSource is a private archival-photo compendium, not a government source - details used here (NVR 1949 note, CO roster, engine rating, 1947 decommissioning location, construction photo) are not independently verified against official records, though the chronology is consistent with DANFS/NHC. The 1,988 shp per-engine figure conflicts with the 2,976 shp reading on NavSource sister pages and the Wikipedia infobox - carried in gaps. Does not address materials or asbestos. Page reached via the navsource.net mirror on 2026-09-22 (navsource.org DNS resolution failed from this machine).

   Atlas source

   true

   Evidence ID

   ev-uss-impeccable-am320-03

4. [4]U.S. Army Corps of Engineers Los Angeles District History (2005), 'Naval Industrial Reserve Shipyard, Alameda' (transcribed by the California Military Department, militarymuseum.org); corroborated by City of Alameda, Final Historic Resources Evaluation - Alameda Marina (30 March 2017) [other_primary]

   Locator

   USACE LA District History (2005) text at militarymuseum.org/NIRSAlameda.html; City of Alameda HRE PDF, Alameda Marina site history section

   Finding type

   historical_record

   Finding

   Builder-yard record for the yard that built this hull: General Engineering & Dry Dock Co. of Alameda (successor to the 1917 Barnes & Tibbitts yard, renamed 1922) built small warships for the U.S. Navy under Contract NObs-344 on four shipbuilding ways with seven fitting-out piers, two marine railways, and a floating dry dock; wartime production included 16 minesweepers of the 1,250-ton group, 11 of the 850-ton group (the Auk-class group this hull belongs to), and four 560-ton net layers. The Navy terminated the contract in 1946; the yard closed in 1948 and the Navy acquired the site 27 June 1950 as Naval Industrial Reserve Shipyard Alameda. The City of Alameda HRE documents the 1940 Maritime Commission-financed rebuild (dry dock plus ~30 shops, warehouses, offices) and the 1962 Pacific Shops acquisition; the site is now Alameda Marina.

   Verification

   verified

   Role

   context

   Documentation level

   ship_specific

   Accessed

   2026-09-22

   Study period

   1917-1962

   Population

   General Engineering & Dry Dock shipyard workforce, Alameda 1940-1948

   Limitations

   Documents the builder yard's wartime configuration and contract - not asbestos conditions, not hull-specific materials, and no exposure data for GE&DD workers. The Atlas shipyards dataset (37 yard_ids) contains no General Engineering & Dry Dock entry - the yard link is carried here and in gaps, not in related_shipyards. Source is a USACE history transcribed by the CA Military Department plus a municipal HRE; production counts attribute to coltoncompany.com (shipbuildinghistory).

   Atlas source

   true

   Evidence ID

   ev-uss-impeccable-am320-04

5. [5]DANFS specifications block + Auk/Raven class technical block (diesel-electric drive, twin screws, ~3,500 hp class figure) + documented status/yard events for this hull (GE&DD construction 1943-44; Terminal Island decommissioning 1947; March 1952 recommissioning, site unstated; Astoria decommissioning and Bremerton reserve layup 1955) [other_primary]

   Locator

   HyperWar class spec block (Auk class via AM-319 sister entry); DANFS narrative status events; NavSource propulsion line

   Finding type

   asbestos_application

   Finding

   Era/class inference: a Navy-contract diesel-electric minesweeper built 1943-44 would have carried period-standard asbestos applications typical of the type - engine-exhaust and muffler lagging, gaskets and flange packing on piping and machinery, electrical cable insulation, deck tile/coverings, bulkhead and accommodation insulation, and brake linings on sweep winches and windlass. The diesel-electric plant (Baldwin VO8 diesels on electric drive, no boilers) means the boiler-room and steam-line insulation load characteristic of steam combatants did not apply to this hull.

   Verification

   inferred

   Role

   supporting

   Documentation level

   class_or_era

   Accessed

   2026-09-22

   Study period

   1943-1955; 1974

   Population

   GE&DD construction trades 1943-44; Terminal Island inactivation workers 1947; reactivation yard workers 1952 (site unstated); Astoria/Bremerton inactivation workers 1955; crew

   Limitations

   Class/era inference only - no hull-specific insulation survey, build specification, or abatement record was located, and nothing here is ship-proven. Does not establish asbestos presence aboard this hull, quantity, or material status at any point in the hull's life; does not establish or defeat any exposure or legal-eligibility claim. HyperWar carries no transcribed DANFS page for AM-320 (404) - the class technical block is cited via the AM-319 sister page.

   Atlas source

   true

   Evidence ID

   ev-uss-impeccable-am320-05

6. [6]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 the Navy's asbestos-protection program and 1975/1979 insulation-removal policies, with fieldwork at Long Beach and Norfolk Naval Shipyards. The Long Beach yard occupies the Terminal Island site where DANFS records this hull's 1947 decommissioning, and Long Beach was the hull's documented 1953-55 homeport - the relevant program-level context for any yard-side insulation work touching this hull.

   Verification

   unverified

   Role

   archival_lead

   Documentation level

   class_or_era

   Accessed

   2026-09-22

   Study period

   1979

   Population

   Navy shipyard workers; asbestos program review

   Limitations

   Yard/program-level documentation, not hull-specific; the GAO fieldwork postdates this hull's USN service and its policy scope concerns naval shipyards generally. Does not establish what insulation was aboard or disturbed on this hull. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403 - standing since Batch 01); content via product-page description.

   Atlas source

   true

   Evidence ID

   ev-uss-impeccable-am320-06

7. [7]Batch-1292 search ledger (this record): NHHC/NHC pages; NavSource; USACE LA District history; City of Alameda HRE; CourtListener API (blocked - throttle); indexed opinion and VA BVA web searches; shipyards.json slug check [other_primary]

   Locator

   search_ledger rows sl-uss-impeccable-am320-01 through sl-uss-impeccable-am320-11

   Finding type

   historical_record

   Finding

   No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or docketed case naming AM-320 was found in the public sources searched (see search_ledger). CourtListener API returned HTTP 429 (2,800/day quota exhausted) - the docket-level litigation check is blocked, not negative; indexed court/VA searches returned no qualifying hit. Name-collision note: the only other Navy ship named Impeccable is USNS Impeccable (T-AGOS-23), the Impeccable-class ocean surveillance ship in service since 22 March 2001 (MSC, Tampa/Halter Marine build, SURTASS) - heavily indexed by the March 2009 South China Sea incident - so post-2001 'Impeccable' references are presumptively T-AGOS-23 and must be hull-checked; the everyday adjective adds noise to unqualified name searches. Law-firm marketing pages list this hull in minesweeper tables - excluded as non-authoritative.

   Verification

   verified

   Role

   negative_finding

   Documentation level

   ship_specific

   Accessed

   2026-09-22

   Study period

   2026-09-22

   Limitations

   Absence of a located public record does not prove absence of asbestos aboard - WWII Navy construction of the era is consistent with era materials having been installed. The hull was sold for scrap in 1974, so present-day material questions are moot; the scrapping site is undocumented. Does not establish that asbestos was or was not present; does not establish or defeat any exposure or legal-eligibility claim.

   Atlas source

   true

   Evidence ID

   ev-uss-impeccable-am320-07

8. [8]NARA record-group path (mapped, not retrieved): RG 24 deck logs (1944-47, 1952-55); BuShips/NAVSEA hull files for AM-320 under contract NObs-344; NIRS Alameda / USACE Los Angeles District files; Pacific Reserve Fleet inactivation work packages (Terminal Island 1947; Astoria/Bremerton 1955); NARA still pictures 80-G-632291, USN 1045919, USN 1045496; MARAD/Navy sale record for the 1974 scrapping [other_primary]

   Locator

   search_ledger row sl-uss-impeccable-am320-10; NHC photo list in ev-uss-impeccable-am320-02

   Finding type

   historical_record

   Finding

   Archival-lead map for hull-level material and maintenance documentation: deck logs for both commissioned periods; construction/outfitting records under the documented NObs-344 contract; builder-yard records (GE&DD site later became NIRS Alameda, documented by USACE); reserve-fleet inactivation records covering the 1947 Terminal Island decommissioning and the 1955 Astoria/Bremerton layup; the three NARA-held photographs cataloged by the NHC Online Library page; and the 1974 disposal record, which would name the scrapping buyer/site.

   Verification

   unverified

   Role

   archival_lead

   Documentation level

   context_only

   Accessed

   2026-09-22

   Study period

   1943-1974

   Limitations

   Record-group mapping is not evidence about this hull - holdings are not digitized and were not retrieved (no spend authorized). Presence of records is inferred from standard NARA custodial practice for Navy hulls of this era.

   Atlas source

   true

   Evidence ID

   ev-uss-impeccable-am320-08