sentences:  During the Missile Crisis, Key West cemented its claim to the title "Gibraltar of the Gulf", coined a hundred years earlier by Commodore David Porter.By 1964, the USAF added an AN/FPS-6A height-finder radar at NAS Key West, which was modified to an AN/FPS-90 set when a second radar was added.Routine general radar surveillance was performed by the USAF at NAS Key West until 1988, upgrading the radar to an AN/FPS-67B in 1966.