FILE - In this July 25, 1946 file photo, a huge mushroom cloud rises above Bikini atoll in the Marshall Islands following an atomic test blast, part of the U.S. military's "Operation Crossroads."
FILE - In this July 25, 1946 file photo, a huge mushroom cloud rises above Bikini atoll in the Marshall Islands following an atomic test blast, part of the U.S. military's "Operation Crossroads." AP
FILE - In this July 25, 1946 file photo, a huge mushroom cloud rises above Bikini atoll in the Marshall Islands following an atomic test blast, part of the U.S. military's "Operation Crossroads." AP