Davy Crockett was a recoilless gun on a tripod for firing the M-388 atomic round
US officials view a W54 nuclear warhead, as used on the Davy Crockett. The unusually small size of the warhead is apparent.
A Davy Crockett casing preserved in the United States Army Ordnance Museum
The M-28 or M-29 Davy Crockett Weapon System was the tactical nuclear recoilless gun (smoothbore) for firing the M-388 nuclear projectile that was deployed by the United States during the Cold War. It was one of the smallest nuclear weapon systems ever built, with a yield between 10 and 20 tons TNT equivalent (40–80 Gigajoules). It is named after American folk hero, soldier, and congressman Davy Crockett.