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NavSource Online: Mine Warfare Vessel Photo Archive


MSO-506 was built for Italy

Storione's call sign:
India Alpha - Kilo - Charlie

AM-506 Class Ocean Minesweeper:

  • Laid down 18 August 1953 as AM-506 by Martinolich Shipbuilding Co., San Diego, CA
  • Launched 13 November 1954
  • Sponsored by Mrs. F. L. Ruhlman
  • Reclassified as an Ocean Minesweeper, MSO-506, 7 February 1955
  • Completed 22 February 1956
  • Transferred to Italy and named Storione (M 5431), 23 February 1956
  • Struck from the Navy list 1 March 1997
  • Fate unknown.


  • Displacement 934 t.
  • Length 190'
  • Beam 36'
  • Draft 12'
  • Speed 15 kts.
  • Complement 81
  • Armament: One 40mm mount and two .50 cal. machine guns
  • Propulsion: Two 1,350shp General Motors diesel engines, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    MSO-506 70k
    MSO-506 97k c. 1957
    Photo courtesy Ing. Auguste Nani from the 1958/1959 edition of Jane's Fighting Ships
    Robert Hurst
    MSC-135 242k 22 April 1957
    Genoa, Italy
    Pioppo (M 5515), ex-MSC-135 is on the left
    Carlo Martinelli
    MSO-506 92k c. 1969
    Italian Navy photo from the 1969/1970 edition of Jane's Fighting Ships
    Robert Hurst
    MSO-506 310k 19 May 2001
    Taranto, Italy
    Carlo Martinelli

    There is no DANFS history available for MSO-506
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    This page created and maintained by Joseph M. Radigan
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