Operation Upshot-Knothole
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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:
| 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 | |
| Climax | 4 June, 1953 | Nevada Test Site | 61 kilotons |