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 Monday, Nov. 25, 1963 file photo, Jacqueline Kennedy, widow of assassinated President John F. Kennedy, holds the U.S. flag that covered the coffin of her husband at Arlington National Cemetery in Arlington, Va. after he was buried. (AP Photo/Eddie Adams)

FILE - In this Monday, Nov. 25, 1963 file photo, Jacqueline Kennedy, widow of assassinated President John F. Kennedy, holds the U.S. flag that covered the coffin of her husband at Arlington National Cemetery in Arlington, Va. after he was buried. (AP Photo/Eddie Adams)

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