Q. Which coup operation was also code-named as "Operation PBSuccess"?
Answer: 1954 Guatemalan coup d'etat
Notes: The 1954 Guatemalan coup d'etat, code-named Operation PBSuccess, was a covert operation carried out by the U.S. Central Intelligence Agency (CIA) that deposed the democratically elected Guatemalan President Jacobo Arbenz and ended the Guatemalan Revolution of 1944–1954. It installed the military dictatorship of Carlos Castillo Armas, the first in a series of U.S.-backed authoritarian rulers in Guatemala.