Castle Yankee

Castle Yankee
Information
CountryUnited States
Test seriesOperation Castle
Test siteBikini Atoll
DateMay 5, 1954
Test typeAtmospheric
Yield13.5 Mt
Test chronology
Mark 17 nuclear bomb

Castle Yankee was the code name given to one of the tests in the Operation Castle series of American tests of thermonuclear bombs. It was originally intended as a test of a TX-16/EC-16 Jughead bomb, but the design became obsolete after the Castle Bravo test was successful. The test device was replaced with a TX-24/EC-24 Runt II bomb which was detonated on May 5, 1954, at Bikini Atoll. It released energy equivalent to 13.5 megatons of TNT, the second-largest yield ever in a U.S. fusion weapon test.