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Declassified Documents
Shortly after this story broke, I filed Freedom of Information Act (FOIA) requests to the military for documents on the Trepang, it’s location during the time of this event, and crew manifests.
The first documents received were from the U.S. NAVY, and included the Trepang’s Command History from January 1971 – January 1972.
DOWNLOAD: USS Trepang Command History: January 1971 – January 1972 [6 Pages, 0.5MB]
Although I still have open FOIA requests to other agencies, you can see by this document that the USS Trepang was involved in weapons tests, and seems to coincide with the theory these could be some type of Naval targets used for practice.