The USS Oxford (AG 159) was originally commissioned a Miscellaneous Auxiliary ship in July 1961 in New York. She was immediately outfitted to participate in the National Security Agency’s Technical Research Ship (TRS) program — though she would not be redesignated an Auxiliary Technical Research Ship (AGTR-1) until years later in 1964.
The Center for Cryptologic History’s Almanac 50th Anniversary Series article, “The TRS Program Part I: The Beginning,” describes perfectly the Oxford’s significant contribution to the Cuban Missile Crisis.