A U.S. Department of Defense production tracing the first use of atomic weapons, opening with the Trinity test detonated in the New Mexico desert and moving to the bombing of Hiroshima and then Nagasaki three days later. The footage is drawn from military archives: the blinding flash and rising cloud over the Alamogordo test range, aerial views of the two Japanese cities before and after the strikes, and the wreckage left where each bomb detonated. As an official government film rather than a journalistic one, it presents the events largely without outside commentary, letting the images of the mushroom clouds and the flattened cityscapes carry the record. There is no narration built around survivor testimony or scientist interviews here, just the documented sequence of the first nuclear test and the two attacks that ended the war in the Pacific. It stands as a primary-source record rather than an analysis of the decision to use the bombs.