Operation Crossroads
There were only seven nuclear bombs in existence in July 1946. The two bombs used in the test were Fat Man plutonium implosion-type nuclear weapons of the kind dropped on Nagasaki. The "Able" bomb was stenciled with the name "Gilda" and decorated with an "Esquire" magazine photograph of Rita Hayworth, star of the 1946 movie, "Gilda". The "Baker" bomb was "Helen of Bikini." This femme-fatale theme for nuclear weapons, combining seduction and destruction, is epitomized by the use in all languages, starting in 1946, of "bikini" as the name for a woman's two-piece bathing suit.
Kokura
Kokura was the backup target for the "Little Boy" bomb on August 6, 1945, so if Hiroshima had been clouded over, the first atomic bomb would have been dropped on Kokura. Kokura was the primary target for the "Fat Man" bomb on August 9, 1945, but on the morning of the raid, the city was obscured by clouds and smoke from the firebombing of the neighboring city of Yahata the day before. Since the mission commander Major Charles Sweeney had orders to drop the bomb visually and not by radar, he diverted to the secondary target, Nagasaki.