Timeline of United States military operations communist attack on a U.S. installation in central Vietnam, the United States escalated its participation in the war to a peak of 543,000 military personnel by April 1969. 1961: Cuba: The Bay of Pigs Invasion, known in Hispanic America as Invasión de Bahía de Cochinos (or Invasión de Playa Girón or Batalla de Girón), was an unsuccessful military invasion of Cuba undertaken by the CIA-sponsored paramilitary group Brigade 2506 on April 17, 1961. 1962: Thailand: The Third Marine Expeditionary Unit landed on May 17, 1962 to support that country during the threat of Communist pressure from outside; by July 30,
CIA activities in Afghanistan by Khalq rival Hafizullah Amin in September. Amin was considered a "brutal psychopath" by foreign observers; even the Soviets were alarmed by the brutality of the Afghan communists, and suspected Amin of being an agent of the U.S. Central Intelligence Agency (CIA), although that was not the case. By December, Amin's government had lost control of much of the country, prompting the Soviet Union to invade Afghanistan, execute Amin, and install Parcham leader Babrak Karmal as president. Carter was surprised by the invasion, as the consensus of the U.S. intelligence community during 1978 and 1979—reiterated as late as September 29,