The Davy Crockett was one of the smallest nuclear weapons ever made by the United States. Built in the late 1950s, and designed for the battlefields of Europe to stop a possible Warsaw Pact invasion, the warhead looked like a watermelon, being only 30 inches long and weighing about 76 pounds. From a portable tripod launcher, it could be fired at the enemy as close as 1,000 feet or up to 13,000 feet away. It was a weapon for nuclear war at close range.

Today, the Davy Crockett system has long since been retired, and is now a neat museum piece. You can see a casing of the warhead at the National Museum of Nuclear Science and History in Albuquerque.

But the little nuclear watermelon is a reminder of the big work still to be done in arms control.

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