B43 nuclear bomb
Overview
 
The B43 was a United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 air-dropped variable yield
Variable yield
Variable yield — or dial-a-yield — is an option available on most modern nuclear weapons. It allows the operator to specify a weapon's yield, or explosive power, allowing a single design to be used in different situations...

 nuclear weapon
Nuclear weapon
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion. Both reactions release vast quantities of energy from relatively small amounts of matter. The first fission bomb test released the same amount...

 used by a wide variety of fighter bomber and bomber aircraft.

The B43 was developed from 1956 by Los Alamos National Laboratory
Los Alamos National Laboratory
Los Alamos National Laboratory is a United States Department of Energy national laboratory, managed and operated by Los Alamos National Security , located in Los Alamos, New Mexico...

, entering production in 1959. It entered service in April 1961. Total production was 2,000 weapons, ending in 1965. Some variants were parachute-retarded and featured a ribbon parachute.

The B43 was built in two variants, Mod 1 and Mod 2, each with five yield options.
 
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