On May 25th, 1953 the U.S. tested nuclear artillery for the first and only time. The shell was fired at the Nevada Test Site (now known as the Nevada National Security Site, or N2S2) as part of Operation Upshot-Knothole with about 3,200 onlookers present.
Although nuclear artillery didn't exactly catch on and has since been replaced by ballistic missiles, this was a significant event for nuclear weapons testing in the U.S.
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