Castle Yankee

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Castle Yankee
Information
Country	United States
Test series	Operation Castle
Test site	Bikini Atoll
Date	May 5, 1954
Test type	Atmospheric
Yield	13.5 Mt
Test chronology
← Castle Union Castle Nectar →

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.