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Military Action

Starfish Prime high‑altitude nuclear test (Operation Dominic)

On July 9, 1962 the United States conducted the Starfish Prime high‑altitude nuclear test above Johnston Island as part of Operation Dominic.

The detonation produced an unexpectedly large electromagnetic pulse that damaged satellites and electrical equipment, revealing EMP vulnerabilities that influenced U.S. nuclear strategy, satellite protection, and later arms‑control and space policy decisions.

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