Sorry, but you are quite wrong about Kwajalein. There is a lot of ignorance and confusion about this.
The Nuclear Test Ban Treaty took effect in 1963, so there were no above-ground nuclear tests in the 70s and 80s. Although Kwajalein is an atoll, the famous nuclear tests occurred at other atolls. Since the 1950s, Kwajalein has been a military facility for tracking of ballistic missiles, re-entry vehicles, and target objects---for which they have powerful radars, much more powerful than used at airports. The radiation warning is simply a warning against intrusion into an airspace that may be subject to radar (microwave) electromagnetic radiation. It can damage or disable aircraft electronics. Thus, the airspace must be controlled for the sake of safety.
The atoll is 1.8 meters high above sea level at its highest point, so it is no surprise that large waves might wash across it. This happens for other islands in the Pacific Ocean (e.g., the north coast of the island of Kuai'i has houses built on stlts in order to cope with this).
Sorry, but you are quite wrong about Kwajalein. There is a lot of ignorance and confusion about this.
The Nuclear Test Ban Treaty took effect in 1963, so there were no above-ground nuclear tests in the 70s and 80s. Although Kwajalein is an atoll, the famous nuclear tests occurred at other atolls. Since the 1950s, Kwajalein has been a military facility for tracking of ballistic missiles, re-entry vehicles, and target objects---for which they have powerful radars, much more powerful than used at airports. The radiation warning is simply a warning against intrusion into an airspace that may be subject to radar (microwave) electromagnetic radiation. It can damage or disable aircraft electronics. Thus, the airspace must be controlled for the sake of safety.
The atoll is 1.8 meters high above sea level at its highest point, so it is no surprise that large waves might wash across it. This happens for other islands in the Pacific Ocean (e.g., the north coast of the island of Kuai'i has houses built on stlts in order to cope with this).