When I was in Kwaj, I couldn't help but notice the strange pictures from around town.
As it turned out, Kwaj was (and still is) a giant target for testing missiles launched from the continental US. Those images are the re-entry trails of the ICBM's launched from California. I found this out on a bike ride around the island. There is a beautiful view on the north side of the island looking into the center of the atoll.