The French owned Clipperton Island?!
OH if correct
UV has it with Clipperton Island.
Indeed French but also visited by Roosevelt who wanted is to become US.
Secretly occupied by the US Navy Seabees who prepared the landing strip. (And lost a Landing vessel)
I had found the chart with the landing strip indicated but no proof it was used until I found a story about a DC7B freighter N756Z used for lobster runs.
N756Z
Of course I also had this photo but that would have been too easy to identify:
OH called
edit:
the Wikipedia article on the masked booby mentiones Clipperton Island 3 times. But Clipperton is not covered in the range chart.