
A number of memorable images came from those tragic few days after President John F. Kennedy was assassinated in Dallas in 1963: Lyndon B. Johnson being sworn in as the successor president on Air Force One, 3-year-old John F. Kennedy Jr. saluting his father's casket in Washington, D.C.
Yet one image, taken directly after Kennedy was shot, captured the attention of news outlets all over the United States. It showed a Secret Service agent jumping onto the back of the presidential limousine to shield the president and first lady.