キャッスル作戦
As "Operation Castle" progressed, the increased yields and fallout caused test locations to be reevaluated. While the majority of the tests were planned for barges near the sand spit of Iroij, some were moved to the craters of "Bravo" and "Union". In addition, "Castle Nectar" was moved from Bikini Atoll to the crater of "Ivy Mike" at Eniwetok for expediency, since Bikini was still heavily contaminated from the previous tests.