 After the war, two Y-1561 Fat Man bombs were used in the Operation "Crossroads" nuclear tests at Bikini Atoll in the Pacific.The first was known as "Gilda" after Rita Hayworth's character in the 1946 movie Gilda, and it was dropped by the B-29 "Dave's Dream"; it missed its aim point by .The second bomb was nicknamed "Helen of Bikini" and was placed without its tail fin assembly in a steel caisson made from a submarine's conning tower; it was detonated beneath the landing craft "USS LSM-60".