The Army's new Skysweeper antiaircraft gun, first shown last week, does not look humanbut it acts human in a baleful way.
When no hostile airplanes are about, the gun squats quietly waiting, its 75-mm. tube projecting out of a mass of electronic equipment. On top, a small, dish-shaped radar antenna peers around, scanning the hemisphere of sky. It can see 15 miles through clouds or darkness.
Suddenly it stops and stares, and a little, tonguelike organ in the center of the dish vibrates with fierce excitement. Somewhere, far beyond human sight, it has spotted an...
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