Special Atomic Demolition Munition (1964). The SADM, popularly known as a “suitcase nuke” or “backpack nuke,” was designed to destroy buildings, bridges, power plants, dams, and other such targets, or to render vast tracts uninhabitable, but was never deployed in combat. The SADM was equipped with a W54—the smallest nuclear warhead in the U.S. arsenal. About 300 were produced in the two years following its introduction in 1964. The army planned to use the weapons in Europe in the event of a Soviet invasion, but all were retired by 1989. The last SADM was dismantled in 1991.