B83 nuclear bomb
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The B83 is a variable-yield thermonuclear gravity bomb developed by the United States in the late 1970s that entered service in 1983. With a maximum yield of 1.2 megatonnes of TNT, it has been the most powerful nuclear weapon in the United States... Wikipedia
Diameter: 18 inches (46 cm)
In service: 1983–present
Length: 12 feet (3.7 m)
Mass: 2,400 pounds (1,100 kg)
No. built: 650