Operation Upshot-Knothole

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The fireball from the Upshot-Knothole Grable test.
The fireball from the Upshot-Knothole Grable test.

Operation Upshot-Knothole was a series of eleven nuclear test shots conducted in 1953 at the Nevada Test Site.

Over twenty-one thousand soldiers took part in the ground exercise Desert Rock V in conjunction with the Grable shot. Grable was a 280mm shell fired from the “Atomic Cannon” and was viewed by a number of high-ranking military officials.

Followed Operation Ivy, preceded Operation Castle. The individual shots were:

Upshot-Knothole Test Blasts
Test Name Date Location Yield Note
Annie 17 March, 1953 Nevada Test Site 16 kilotons  
Nancy 24 March, 1953 Nevada Test Site 24 kilotons  
Ruth 31 March, 1953 Nevada Test Site 0.2 kilotons Partial Misfire 
Dixie 6 April, 1953 Nevada Test Site 11 kilotons  
Ray 11 April, 1953 Nevada Test Site 0.2 kilotons Partial Misfire 
Badger 18 April, 1953 Nevada Test Site 23 kilotons  
Simon 25 April, 1953 Nevada Test Site 43 kilotons  
Encore 8 May, 1953 Nevada Test Site 27 kilotons  
Harry 19 May, 1953 Nevada Test Site 32 kilotons  
Grable 25 May, 1953 Nevada Test Site 15 kilotons nuclear artillery, gun-type fission weapon
Climax 4 June, 1953 Nevada Test Site 61 kilotons  


Film about Upshot Knothole Tests

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