In September 1956, Somoza Garcia was fatally shot by a young dissident poet, Rigoberto López Pérez, and was succeeded in the presidency by his elder son, Luis Somoza Debayle, while his youngest son Anastasio Somoza Debayle, a graduate of the United States Military Academy at West Point became the Chief Director of the National Guard. Brutal repression of the internal political opposition followed suit. In 1957, the National Guard was involved in the only external military action of its existence, a brief border skirmish with Honduras. In 1961, the National Guard cooperated with the U.S. Central Intelligence Agency in the preparation for the abortive Bay of Pigs Invasion of Cuba, permitting its bases to be used for training and staging areas. From May 1965 to September 1966, one infantry company of the National Guard participated in a peacekeeping operation in the Dominican Republic alongside U.S., Brazilian, Paraguayan, Honduran and Costa Rican troops as part of the Interamerican Pacification Force (FIP), deployed under the aegis of the Organization of American States (OAS). The guard's domestic power, however, gradually broadened to embrace not only its original internal security and police functions but also control over customs, telecommunications, port facilities, radio broadcasting, the merchant marine, and civil aviation.