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Special Atomic Demolition MunitionThe Special Atomic Demolition Munition (SADM) was a United States Navy and Marines project that was demonstrated as feasible in the mid-to-late 1960s, but was never used. The project, which involved a small nuclear weapon, was designed to allow one individual to parachute from any type of aircraft carrying the weapon package and place it in a harbor or other strategic location that could be accessed from the sea. Another parachutist without a weapon package would follow the first to provide support as needed. The two-man team would place the weapon package in the target location, set the timer, and swim out into the ocean where they would be retrieved by a submarine or other high-speed water craft. The parachute jumps and the retrieval procedures were practiced extensively. In the 1950s and 1960s, the United States developed several different types of lightweight nuclear devices. The main one was the Mk-54, a cylinder 40 by 60 centimetes that weighed 68 kilograms (the warhead was a variation of one developed for the Davy Crockett nuclear recoilless rifle). It was fired by a mechanical timer and had a variable yield from 10 tons up to one kiloton. 300 SADMs were assembled and remained in the US arsenal until 1989. External link
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