He attended El Monte Union High School in California before joining the United States Marine Corps in 1954.
[2] Hemming left the Marines in October 1958 and the following year traveled to Cuba where he aided Fidel Castro and his revolutionary forces.
[citation needed] Hemming was a leader of Interpen, or Intercontinental Penetration Force, a group of anti-Castro guerrillas who trained at No Name Key in the early 1960s.
One document dated May 12, 1961, claims that Allen Lushane of Miami "had made a trip to Texas to recruit Americans for some future military action against the Government of Cuba".
[3] Hemming claimed that in January 1959 he met Lee Harvey Oswald at the Atsugi Naval Air Station in Japan.
[citation needed] According to Victor Marchetti, he was also Lee Harvey Oswald's case officer at then-secret NAF Atsugi.
These include Anthony Summers (Conspiracy), Noel Twyman (Bloody Treason) and John M. Newman (Oswald and the CIA).
This included Hemming, James Arthur Lewis, Roy Hargraves, Edwin Collins, Steve Wilson, David Sanchez Morales, Herminio Diaz Garcia, Tony Cuesta, Eugenio Martinez, Virgilio Gonzalez, Felipe Vidal Santiago and William "Rip" Robertson.
In the article Marchetti argued that the House Select Committee on Assassinations (HSCA) had obtained a 1966 CIA memo that revealed Hemming, E. Howard Hunt, and Frank Sturgis had been involved in the plot to kill Kennedy.
As a result of obtaining depositions from David Atlee Phillips, Richard Helms, G. Gordon Liddy, Stansfield Turner, and Marita Lorenz, plus a skillful cross-examination by Lane of E. Howard Hunt, the jury decided in January, 1985, that Marchetti had not been guilty of libel when he suggested that John F. Kennedy had been assassinated by people working for the CIA.
He delivered brief remarks before making himself available for questions from the panelists: Gordon Winslow, Jerry Rose, George Michael Evica, and Charles Drago.