50 years later: The unfulfilled promise of John F. Kennedy and his generation-defining death

The nation marks a half-century since the assassination of President John F. Kennedy. Many who were alive on that fateful day recall exactly where they were and what they were doing.

FILE - In this July 26, 1963 file photo, U.S. President John F. Kennedy sits behind microphones at his desk in Washington after finishing his radio-television broadcast to the nation on the nuclear test ban agreement initialed by negotiators in Moscow. (AP Photo/John Rous)

FILE - In this July 26, 1963 file photo, U.S. President John F. Kennedy sits behind microphones at his desk in Washington after finishing his radio-television broadcast to the nation on the nuclear test ban agreement initialed by negotiators in Moscow. (AP Photo/John Rous)

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