Photo: Lyndon B. Johnson’s swearing in aboard Air Force One

Cecil Stoughton’s images of the trip to Texas by John F. Kennedy provide key beats in the story on the fateful day of the president's assassination. Later, Stoughton made perhaps the most famous—and most important—image ever taken by a presidential photographer as LBJ is sworn in on Air Force One.

Photograph by Cecil Stoughton, White House/JFK Library, Boston