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NavSource Online: Mine Warfare Vessel Photo Archive

Pioneer (AM / MSF 105)



Call sign:
November - Alpha - Romeo - November



Pioneer served the Navies of the United States and Mexico.

Auk Class Minesweeper: Laid down, 30 October 1941 by the Pennsylvania Shipyards, Inc., Beaumont, TX; Launched, 26 July 1942; Commissioned USS Pioneer (AM 105), 27 February 1943; Decommissioned, 8 July 1946 at San Diego, CA; Reclassified a Fleet Minesweeper (Steel-hulled) MSF-105, 7 February 1955; Struck from the Naval Register, 1 July 1972; Sold to Mexico, 19 September 1972 and renamed Leandro Valle (C 70); Reclassified P-101, (date unknown).
Fate unknown.

Specifications: Displacement 1,250 t.; Length 220' 6"; Beam 32'; Draft 10' 9"; Speed 18 kts; Complement 105; Armament one single 3"/50 gun mount, two twin 40mm gun mounts, two single 20mm gun mounts, two depth charge tracks, five depth charge projectiles; Propulsion two Busch Sulzer Brothers diesel engines, 3,118 shp, two shafts.


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For Full Size Image
Size Image Description Source
Pioneer 78k c. 1943 .
Pioneer 78k ARM Leandro Valle (P 101)
Mexican Navy Photo
Mexican Navy

View the Pioneer (AM/MSF 105)
DANFS History entry located on the Haze Gray & Underway Web Site. The main archive for the DANFS Online Project.

Crew Contact And Reunion Information
U.S.Navy Memorial Foundation
Fleet Reserve Association
Additional Resources and Web Sites of Interest
Naval Minewarfare Association
Association of Minemen

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