Jack Hemingway entered the army as an officer with the military police; the eldest son of writer Ernest Hemingway, he spent most of his war assigned to the CIA precursor, the OSS. (Ernest Hemingway Photograph Collection/John F. Kennedy Presidential Library and Museum, Boston)

Ernest Hemingway Photograph Collection/John F. Kennedy Presidential Library and Museum, Boston (Ernest Hemingway Photograph Collection/John F. Kennedy Presidential Library and Museum, Boston)

Ernest Hemingway Photograph Collection/John F. Kennedy Presidential Library and Museum, Boston