It is a picture of one of the darkest moments in American history. In it, a US Secret Serviceman climbs onto the back of the open-roofed Lincoln Continental where President John F. Kennedy lies fatally wounded. First Lady Jacqueline Kennedy is attempting to clamber from the vehicle.
Jackie Kennedy and a Secret Service agent react moments after President John F. Kennedy was shot in Dallas, Texas, in November 1963.
Moments before, as Kennedy was waving at crowds in Dallas, Texas, the fatal shots were fired from a nearby multi-storey book depository.
The assassination on November 22, 1963, shocked the world — and also led to a total rethink of how the presidential cars are designed.
The open-roofed Lincoln Continental left the president uniquely exposed, and future models enclosed the president in ever-thicker layers of armor and protection.
Below, Business Insider looks over the evolution of the presidential limo in the last four decades.