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circa 1940: Future American president John F Kennedy (1917 - 1963) sits at a typewriter, holding open his published thesis, 'Why England Slept'. (Photo by Hulton Archive/Getty Images)

circa 1940:  Future American president John F Kennedy (1917 - 1963) sits at a typewriter, holding open his published thesis, 'Why England Slept'.  (Photo by Hulton Archive/Getty Images)

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Naval Lieutenant and future President John F Kennedy on board the torpedo boat he commanded in the Southwest Pacific. (Photo by MPI/Getty Images)

Naval Lieutenant and future President John F Kennedy on board the torpedo boat he commanded in the Southwest Pacific. (Photo by MPI/Getty Images)

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circa 1955: U.S. senator John F. Kennedy (1917-1963) sits and gesticulates as he speaks with one leg crossed over his knee and one hand in his pocket. (Photo by George Tames/New York Times Co./Getty Images)

circa 1955:  U.S. senator John F. Kennedy (1917-1963) sits and gesticulates as he speaks with one leg crossed over his knee and one hand in his pocket.  (Photo by George Tames/New York Times Co./Getty Images)

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1962: US statesman John F Kennedy, 35th president of the USA, making a speech. (Photo by Central Press/Getty Images)

1962:  US statesman John F Kennedy, 35th president of the USA, making a speech.  (Photo by Central Press/Getty Images)

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L - R: American politician brothers, US attorney-general Robert Kennedy (1925 - 1968), US senator Edward Kennedy, and US president John F. Kennedy (1917 - 1963) speak while seated behind a desk, circa 1962. (Photo by Hulton Archive/Getty Images)

L - R: American politician brothers, US attorney-general Robert Kennedy (1925 - 1968), US senator Edward Kennedy, and US president John F. Kennedy (1917 - 1963) speak while seated behind a desk, circa 1962. (Photo by Hulton Archive/Getty Images)