The W64 nuclear warhead was the Los Alamos Laboratory's entry into a brief competition between Lawrence Livermore Laboratory and Los Alamos to design an "enhanced-radiation" nuclear warhead (i.e., a " neutron bomb") for the

United States Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cla ...

's MGM-52 Lance tactical surface-to-surface missile. In July 1964, both Livermore Labs and Los Alamos started developing competing warheads for the Lance. The Los Alamos design, the W64, was canceled in September 1964 in favor of Livermore's W63. In November 1966, the

W63 The W63 was the Lawrence Livermore Laboratory's entry into a brief competition between Livermore and Los Alamos to design a warhead for the Army's Lance tactical surface to surface missile. In July 1964 both Livermore Labs and Los Alamos started d ...

was canceled in favor of the

W70 W70 was a two-stage, thermonuclear warhead that was developed for the MGM-52 Lance missile by the United States. Designed by Lawrence Livermore National Laboratory, the Mod 1 and Mod 2 version of the weapon entered service in 1973, while the enha ...

, the model that finally entered production.

References

* Nuclear weapons of the United States {{Nuclear-weapon-stub