T/Sgt. Daniel Murphy demonstrates the "Hoppi-Copter," a one-man helicopter strapped to the shoulders like a knapsack and capable of flying a fully armed man, in Washington on Feb. 15, 1952. This is an actual model, but Sgt. Murphy didn't fly it. It came from inside Constitution Hall, part of an exhibit of Navy firepower and technology. (AP Photo/Harvey Georges)

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