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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 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.