Cryptonym: AEOCEAN-3
Mr. Lee Harvey Oswald, 104-10067-10212
A document that reveals the true name of Thomas B Casasin was Jacques Richardson. http://documents.theblackvault.com/documents/jfk/NARA-July2017/JFK-July_2017_Release-Formerly_released_in_part/DOCID-32347922.PDF
104-10429-10239 :DISPATCH:LEE HARVEY OSWALD/FORWARDED MEMO BY THOMAS B. CASASIN
The document identifies AEOCEAN-3 as the first notable case of defectors immigrating with Soviet women and these women possibly being sleeper agents.
104-10065-10082: CABLE OF HSCA STAFFER BRADY INTERVIEW
A document which explains that Casasin (Richardson) did not need to identify his agent **OCEAN-3, the first two letters of the cryptonym are redacted.
Truth vs Evasion, Documents and Dossiers, Assassination Archives and Research Center
A series of documents and commentary reviews the CIA bungling of a defection case and related matters to the CIA Soviet Russia Division. One portion reveals a new document that details the marriage of AEOCEAN-3 (Philip R. Neilson) to Tamara Kungarova, his Russian bride while he was a tourist agent for the CIA. http://aarclibrary.org/truth-vs-evasion/
104-10012-10111: FOREIGNERS WHO MARRY USSR CITS
The document states "On his second trip to the USSR in January 1959, Philip Robert Neilson, REDSKIN agent, was given an INTOURIST interpreter/guide Tamara Stepanova Kungrova. A romance developed between them and Neilson became determined to marry her, which he finally did in the spring of 1962."