This is a somewhat rare motorcade picture -- an aerial view of JFK's limousine
in downtown Dallas on 11/22/63. Note that driver Bill Greer has his door
open (probably in an effort to keep the crowd back, because the police
motorcycles on the left side of the car were likely not in their normal positions
when this picture was snapped, due to the heavy crowds on that side of the street).

Also barely visible on the far right side of this photo is Secret Service agent
Clint Hill, who was riding on the rear bumper of the limousine when this
picture was taken. He rode on the bumper when the crowds got very thick,
which occurred approximately four times during the Dallas motorcade.