A U.S. Senate Select Intelligence Committee report later confirmed over eight attempted plots to kill Castro between 1960 and 1965, as well as additional plans against other Cuban leaders. After weathering the failed Bay of Pigs invasion, Cuba observed as U.S. armed forces staged a mock invasion of a Caribbean island in 1962 named Operation Ortsac. The purpose of the invasion was to overthrow a leader whose name, Ortsac, was Castro spelled backwards. Tensions between the two nations reached their peak in 1962, after U.S. reconnaissance aircraft photographed the Soviet construction of intermediate-range missile sites. The discovery led to the Cuban Missile Crisis.