Davy Crockett
Nuclear device
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The M-28 or M-29 Davy Crockett Weapon System was a tactical nuclear recoilless smoothbore gun for firing the M388 nuclear projectile, armed with the W54 nuclear warhead, that was deployed by the United States during the Cold War. Wikipedia
Blast yield: 20 tonnes of TNT (84 GJ)
Crew: 5
Effective firing range: M28 1.25 miles (2.01 km); M29 2.5 miles (4.0 km)
Mass: : M28 108.5 pounds (49.2 kg), unloaded; M29 316 pounds (143 kg), unloaded;