Castle Romeo

Castle Romeo
Castle Romeo mushroom cloud
Information
CountryUnited States
Test seriesOperation Castle
Test siteBikini Atoll
DateMarch 26, 1954
(70 years ago)
 (1954-03-26)
Test typeAtmospheric
Yield11 Mt
Test chronology

Castle Romeo was the code name given to one of the tests in the Operation Castle series of U.S. nuclear tests. It was the first test of the TX-17 thermonuclear weapon, the first deployed thermonuclear bomb.

It was detonated on March 26, 1954, at Bikini Atoll of the Marshall Islands, on a barge moored in the middle of the crater from the Castle Bravo test. It was the first such barge-based test, a necessity that had come about because the powerful thermonuclear devices obliterated the small islands following detonation.