In this fourth installment of our miniseries, Ground Zero: JM WAVE and the Cuban Question (Episode 3A), we explore how the secret war against Fidel Castro dramatically escalated in the summer and autumn of 1963 while Operation Tilt unraveled. The CIA partnered with the U.S. military to train a formidable exile commando force, placing Army Captain Bradley Ayers and explosives expert Major Edward Roderick under civilian cover at Ledbury Lodge on Elliott Key to prepare strike teams for sabotage against Cuban oil refineries, power plants, and sugar mills. Military bases across the country—including Fort Stewart, Camp Mackall, and Eglin Air Force Base—provided live-fire, airborne, and survival training, while station chief Ted Shackley and paramilitary head David Sanchez Morales operated their own deniable strike unit, the Commandos Mambises, launching raids from Central America off the CIA mother ship Rex. At the exact same time, federal authorities cracked down ruthlessly on non-sanctioned exile groups, engaging in high-speed boat chases through South Florida canals, raiding William McLaney’s Lake Pontchartrain weapons cache in Louisiana, and arresting raiders who were attempting to relocate operations abroad. We trace how JM WAVE’s psychological warfare branch, directed by case officer George Joannides, financed and guided the militant student group DRE (Directorio Revolucionario Estudantil) under code name AMSPELL. In August 1963, 23-year-old unemployed ex-Marine Lee Harvey Oswald walked into Casa Roca on Decatur Street in New Orleans, offering to help DRE delegate Carlos Bringuier train anti-Castro guerrillas before turning around days later to distribute Fair Play for Cuba Committee leaflets on Canal Street. Following a street confrontation, their police arrest, and a heated live debate on WDSU radio, DRE military chief Isidro "Chilo" Borja confirmed that a comprehensive intelligence file on Oswald was dispatched straight to their CIA contacts at JM WAVE in Miami. We also follow the trail connecting Oswald's Spanish language instructor, Ernesto Rodriguez, to his brother Emilio Rodriguez—Tony Sforza’s partner in the Havana stay-behind network and chief of the AMOT intelligence service at JM Wave.—revealing direct pipelines linking the accused assassin to the CIA’s Miami nerve center. We dissect the delicate, high-stakes diplomatic dialogue unfolding simultaneously behind the scenes between Washington and Havana. Spearheaded by ABC News journalist Lisa Howard and U.S. diplomat William Attwood, secret bilateral talks were initiated in September 1963 in the corner of a crowded cocktail party inside Howard’s Manhattan apartment with Cuban UN Ambassador Carlos Lechuga. As Attwood established communication with Castro’s personal physician, Dr. René Vallejo, Castro offered to send a private plane to Key West for face-to-face negotiations that excluded Che Guevara, an initiative President Kennedy personally approved in the Oval Office under strict conditions of plausible deniability. Yet, this fragile peace overture stood in stark, dangerous contrast to CIA covert plots: just hours after Castro issued a public warning at the Brazilian embassy that U.S. leaders aiding terrorist assassination plots "themselves will not be safe," CIA headquarters cabled instructions to approach Cuban Major Rolando Cubela (code name AMLASH) as a chief coup conspirator. Finally, we examine the fateful autumn weeks when these conflicting tracks collided with catastrophic consequences. In late October 1963, CIA Special Affairs Staff chief Desmond Fitzgerald flew to Paris, presenting himself to Cubela as Robert F. Kennedy’s personal representative while Cubela requested a high-powered rifle with telescopic sights to assassinate Castro. Meanwhile in Miami, anti-Castro exiles caught wind of rumors regarding a secret White House accommodation with Moscow for a "Tito-type" communist regime, transforming exile grief and disillusionment into personal, burning fury against President Kennedy. As operatives like Felipe Vidal Santiago and CIA-connected trainers reported that street-level Cubans openly branded JFK a traitor who deserved to be killed, and as French journalist Jean Daniel carried Kennedy’s private message to Havana, the stage was set for President Kennedy’s arrival in Miami on November 18, just four days before Dallas.