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Ship Name and Designation History

This section lists the names and designations that the ship had during its lifetime. The list is in chronological order.

    Aggressive Class Minesweeper
    Keel Laid 16 April 1952 - Launched 15 April 1953

  1. USS FIRM AM-444
    Commissioned 12 October 1954

  2. USS FIRM MSO-444
    Reclassified Ocean Minesweeper (MSO) 7 February 1955
    Decommissioned 5 July 1972

  3. RPS DAVAO del SUR PM-92 (Philippine Naval Service)
    Loaned to the Philippines and renamed 5 July 1972
    Returned to U.S. custody 1 July 1977

    Struck from the Naval Register 1 July 1977
    Sold for scrap 8 July 1977

Naval Covers

This section lists active links to the pages displaying covers associated with the ship. There should be a separate set of pages for each name of the ship (for example, Bushnell AG-32 / Sumner AGS-5 are different names for the same ship so there should be one set of pages for Bushnell and one set for Sumner). Covers should be presented in chronological order (or as best as can be determined).

Since a ship may have many covers, they may be split among many pages so it doesn't take forever for the pages to load. Each page link should be accompanied by a date range for covers on that page.

  1. USS Firm MSO-444 Covers Page 1     (DATE RANGE)



This section lists examples of the postmarks used by the ship. There should be a separate set of postmarks for each name and/or commissioning period. Within each set, the postmarks should be listed in order of their classification type. If more than one postmark has the same classification, then they should be further sorted by date of earliest known usage.

A postmark should not be included unless accompanied by a close-up image and/or an image of a cover showing that postmark. Date ranges MUST be based ONLY ON COVERS IN THE MUSEUM and are expected to change as more covers are added.
>>> If you have a better example for any of the postmarks, please feel free to replace the existing example.


Postmark Type
Killer Bar Text

Thumbnail Link
Postmark Image
Thumbnail Link
Cover Image


USPO Slogan
Machine Postmark

Long Beach, CA


Ther ship had no postal facilities.


Other Information

NAMESAKE - Unyielding.

Two ships of the US Navy have borne the name FIRM - USS Firm AM-98 and USS Firm MSO-444.



If you have images or information to add to this page, then either contact the Curator or edit this page yourself and add it. See Editing Ship Pages for detailed information on editing this page.


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