From: (Chuck)
Date: 7/10/2003 09:46 Pacific Daylight Time

GTR = General Technological Research. The USS Liberty AGTR-5 and the
USS Belmont AGTR-4 were the only two US ships with GTR hull numbers then
(I think), and both were USN Sigint ships.

They were the two Victory-class hulls.

Three Liberty-hull GTRs had been commissioned:

Oxford (AGTR-1), Georgetown (-2) and Jamestown (-3)

MW
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"As soon as movement begins, so does the fog of war" - Edward N. Luttwak