Ivy Mike was the codename given to the first full-yield test of a multi-stage thermonuclear device, also known as the Teller–Ulam design. Ivy Mike was detonated on November 1, 1952, by the United States on the island of Elugelab in Enewetak Atoll, Pacific Proving Grounds, as part of Operation Ivy.
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The 74th anniversary falls on October 31, 2026.