Test Code-Name: GRABLE
The firing of GRABLE from a 280 mm cannon, marked the first time an
atomic artillery shell was fired and detonated. This was the only time
a nuclear artillery shell was ever fired. The Secretary of Defense, the
Secretary of the Army, and the Army Chief of Staff, along with 96
Congressional observers, viewed the detonation from an area 11
kilometers west of ground zero.XX-12 GRABLE was fired on May 25, 1953
http://www.jumpingpixels.com/nuclearartillery.html
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