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In the United States, efforts to develop precision guided munitions PGMs began during the First World War and resulted in an 'aerial torpedo' by the 1920s. While World War II was dominated by large-scale strategic bombing essentially throwing out tons of free-falling munitions in the hope they hit something important both sides in the war worked to develop airborne munitions that could be steered toward a target. However after that war, U.S. national security policy focused on the atomic bomb, hardly a weapon that needed to be directed...