During WWII, the U.S. Army determined that there was a need for a mobile long range heavy artillery weapon to attack strategic targets behind enemy lines - communication centers, fortified positions, enemy long range artillery and other high value targets. After the war, it was determined that a heavy artillery weapon that could fire an atomic warhead would be even more desirable. This kicked off More..a dual development effort - designing and building the actual weapon and designing a small enough atomic warhead to be used as a shell for the weapon.
In 1952, the cannon was complete. The 280-mm Atomic Cannon weighted 88 tons and was transported by two vehicles capable of moving at speeds up to 40 miles per hour. The cannon could be set up and ready to fire in 15 minutes or less.
But it wasn't until 1953 that it could be tested with an atomic shell.
On May 25, 1953, during the Op
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