On May 25, 1953, at the Nevada Test Site, the US Army fired its M65 "Atomic Annie" 280-mm cannon in the Grable test of Operation Upshot-Knothole. The W9 nuclear shell traveled about 7 miles and detonated as an airburst with a yield of 15 kilotons—the only time a nuclear artillery projectile was ever fired from a cannon. #usarmy #nuke #bomb #missile #armybomb #unitedstates🇺🇸 #nevada #ad #tophistoric | Historic Moments