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The Soviet Union detonates a 400 kiloton  thermonuclear weapon at the Semipalatinsk Test Site, Kazakhstan, in August 1953.  Dubbed  Joe-4 by the west, the bomb was significant because it was a deliverable thermonuclear device — a milestone the U.S. would not reach until May 1956.  (Photo courtesy of the Nuclear Weapons Archive)


Joe-4 Detonates

The Soviet Union detonates a 400 kiloton thermonuclear weapon at the Semipalatinsk Test Site, Kazakhstan, in August 1953. Dubbed Joe-4 by the west, the bomb was significant because it was a deliverable thermonuclear device — a milestone the U.S. would not reach until May 1956. (Photo courtesy of the Nuclear Weapons Archive)

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