- Upshot-Knothole Dixie
The fourth test firing of the atomic weapons test series
Operation Upshot-Knothole , conducted in 1953 by the United States at theNevada Test Site .Upshot-Knothole Dixie was an 11 kiloton airdrop shot which detonated at 6,000 feet altitude, the highest airburst detonation cunducted to that date.
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