The W67 was an American thermonuclear warhead which was developed in the mid 1960s but then cancelled prior to any production or service use in 1967.

The W67 was intended to be a new warhead for both land and sea based ballistic missiles, specifically the UGM-73 Poseidon

UGM-73 Poseidon

The Poseidon missile was the second US Navy ballistic missile system, powered by a two-stage solid fuel rocket. It succeeded the Polaris missile beginning in 1972, bringing major advances in warheads and accuracy...

 and Minuteman III (LGM-30G)

LGM-30 Minuteman

The LGM-30 Minuteman is a U.S. nuclear missile, a land-based intercontinental ballistic missile . As of 2010, the version LGM-30G Minuteman-III is the only land-based ICBM in service in the United States...

 missiles.

The design was developed by Lawrence Radiation Laboratory (now Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory

The Lawrence Livermore National Laboratory , just outside Livermore, California, is a Federally Funded Research and Development Center founded by the University of California in 1952...

).

After its cancellation, the W68

W68

The W68 warhead was the warhead used on the UGM-73 Poseidon SLBM missile. It was developed in the late 1960s at Lawrence Livermore National Laboratory.-Specifications:The W68 weighs...

 warhead was used for the Poseidon and the W78

W78

The W78 thermonuclear warhead is the warhead used on most of the United States LGM-30G Minuteman III intercontinental ballistic missiles , along with the MK-12A reentry vehicle which carried the warhead. Minuteman III's initially deployed with the older W62 warhead; the W78 was deployed starting...

for the Minuteman III.

External links

• Allbombs.html list of all US nuclear weapons at nuclearweaponarchive.org