TIL the flag of Bikini Atoll is symbolic of the islanders' belief that a debt is still owed by the U.S. to the atoll because of the thermonuclear detonations on the islands. :
After 75 years, it's time to clean Bikini - Bulletin of the Atomic Scientists
Bikini Atoll - Wikipedia
Bikini Atoll Today | U.S. Nuclear Testing Site in 1940s and 1950s