Arrival ceremonies motorcade for President Mohammad Ayub Khan of Pakistan. In car (Lincoln Continental with bubble top): Secret Service Agent Gerald “Jerry” Behn (front seat, left); Military Aide to the President General Chester V. Clifton (front seat, center; mostly hidden); Secret Service agent William Greer (driving); President Mohammad Ayub Khan (back seat, left); President John F. Kennedy. United States Air Force and Navy Honor Guards in background. Andrews Air Force Base, Maryland.