The W-71 nuclear warhead was a US thermonuclear warhead developed at Lawrence Livermore National Laboratory in California and deployed on the LIM-49A Spartan, a component of the Safeguard Program, an anti-ballistic missile defense system briefly deployed by the US in the 1970s. Film of the test has been declassified and can be seen in the third of the Atomic Journeys documentaries Welcome To Ground Zero. Thirty units were produced in 1974 and 1975. The weapons went into service, but were then taken right back out of service in 1975 and the warheads stored until 1992 when they were dismantled.