“Success cannot be advertised; failure cannot be explained. In the work of intelligence, heroes are undecorated and unsung, often even among their own fraternity.”That was how President Dwight D. Eisenhower summed up the challenge, the frustration and the duty of intelligence professionals. He was speaking on Nov. 3, 1959 at the ceremony to lay the cornerstone of the new Central Intelligence Agency (CIA) headquarters in Langley, Virginia.