 Complete the following phrase:  Roca is the son of Blas Roca Calderio, one of the founders of the Communist Party of Cuba. In 1961, at the age of 18, he was among the first batch of a young elite selected for training as fighter pilots in the Soviet Union. He served for ten years in the Cuban Armed Forces, and subsequently worked as an economist for the government. He became an active dissident in 1991, four years after his fathers death. Roca and his father were close, though the son never had the same enthusiasm for Fidel Castros 1959 