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 Tuesday, Oct. 29, 2013 file photo, Arlington House sits atop a hill overlooking the eternal flame at the grave site of President John F. Kennedy at Arlington National Cemetery in Arlington, Va. (AP Photo/Susan Walsh, File)

FILE - In this Tuesday, Oct. 29, 2013 file photo, Arlington House sits atop a hill overlooking the eternal flame at the grave site of President John F. Kennedy at Arlington National Cemetery in Arlington, Va. (AP Photo/Susan Walsh, File)

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