Mark 15 nuclear bomb

[1] The Mod 1 corresponds to the Castle Nectar test of the Zombie weapon prototype.

The experimental W39 devices were initially tested as the TX-15-X3 (which is identical to the W39 Mod 0 design).

On February 5, 1958, during a training mission flown by a B-47, a Mk 15 nuclear bomb, was lost off the coast of Tybee Island, Georgia near Savannah.

If the core was replaced with a dummy, it would be non-nuclear but still capable of creating a conventional explosion.

After the incident, the Air Force assured the public that the nuclear capsule was removed prior to the flight and fitted with a simulated 150-pound cap made of lead.