W42
Encyclopedia
The W42 was an American
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 nuclear warhead developed in 1957.

In December 1957 the Army
Army
An army An army An army (from Latin arma "arms, weapons" via Old French armée, "armed" (feminine), in the broadest sense, is the land-based military of a nation or state. It may also include other branches of the military such as the air force via means of aviation corps...

 requested the Atomic Energy Commission
United States Atomic Energy Commission
The United States Atomic Energy Commission was an agency of the United States government established after World War II by Congress to foster and control the peace time development of atomic science and technology. President Harry S...

 to develop a nuclear warhead for the HAWK low-to-medium altitude surface to air missile. In July 1958 the military characteristics were approved for the new warhead and the design released. Two months later the requirement for a HAWK with a nuclear warhead was cancelled.
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