Now, here's the problem. Utirik Atoll (also Utrik or Utrōk) and Taka Atoll were used as nuclear test sites during WWII. There was only one nuclear test site in WWII. That was Trinity, in New Mexico, where the Nagasaki bomb was tested. The Hiroshima bomb was never tested. The scientists were sure it would work, and it did.
Check the links I made it the post.
Maybe I worded it wrong. Make that ... since WWII.