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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.

    Portunus Class Motor Torpedo Boat Tender
    Keel Laid October 28 1943 as Tank Landing Ship LST-519
    Redesignated December 18 1943
    Launched March 20 1944

  1. USS LST-604
    Placed in Ferry Commission April 8-29 1944
    Reclassified Motor Torpedo Boat Tender (AGP) August 9 1944

    Commissioned August 9 1944 - Decommissioned March 14 1946

    Struck from Naval Register April 17 1946
    Sold July 25 1947 for scrap

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. 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

Date From
Date To
Thumbnail Link To
Postmark Image
Thumbnail Link To
Cover Image

2nd Commissioning August 9 1944 to March 14 1946


Locy Type


GregCiesielski Silenus AGP11 19450120 1 Postmark.jpg
GregCiesielski Silenus AGP11 19450120 1 Front.jpg

Registered, Official Business. The two 10c stamps were required to pay the Registered Mail fee.


Locy Type


GregCiesielski Silenus AGP11 19450120 1 Back.jpg
GregCiesielski Silenus AGP11 19450120 1 Front.jpg

Tracking the Movement - Jan 20 1945 USS Silenus; Jan 20 1945 Navy Branch 10614 Naval Advance Base, Solomon Islands; Jan 22 1945 Navy Branch 145 FPO Koli Point, Guadalcanal, Solomon Islands; Jan 26 1045 Navy Branch 10088 Postal Concentration Center, Pearl Harbor Hawaii, Jan 26 1945 Navy Branch 10461 Commander in Chief, Pacific Fleet, Pearl Harbor Hawaii.


Other Information

SILENUS received one battle star for World War II service

Awards, Citations and Campaign Ribbons...
American Campaign Medal - Asiatic-Pacific Campaign Medal (1) - World War II Victory Medal - Navy Occupation Service Medal (with Asia clasp)

NAMESAKE - In Greek mythology, Silenus was the son of Hermes and a nymph, the oldest of the Satyrs.



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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