Evelyn Lincoln served as the personal secretary to John F. Kennedy from his election to the United States Senate in 1953 until his death in 1963. These letters span Kennedy's presidency, from 1961 to 1963, and include mention of the Cuban missile crisis, JFK's visits to Ireland, and his ancestral Irish past. Also of note is the "Project Mercury" stamp used on the Dec. 1962 letter. Project Mercury was the first human spaceflight program of the United States, running from 1958 through 1963.