This Is Not A Test
![](https://media.wnyc.org/i/800/0/c/85/1/Nuclear_artillery_test_Grable_Event_-_Part_of_Operation_Upshot-Knothole.jpg)
A 15-kiloton test fired from a 280-mm cannon on May 25, 1953 at the Nevada Proving Grounds.
( National Nuclear Security Administration )
( National Nuclear Security Administration )
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