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Project Argus High Altitude Nuclear Effects Program

Project Argus mattered because it tried to weaponize a region that states had barely begun to understand. What the United States wanted was not simply another nuclear test. It wanted proof that a very high-altitude detonation could rewrite the electromagnetic environment itself—creating trapped radiation, disrupting communications, and potentially interfering with hostile weapons. In that form, Argus became more than a strange side experiment in the last months before the 1958 test moratorium. It became one of the clearest early black programs in which Cold War planners treated the upper atmosphere and near-space environment as a manipulable battlespace.