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| The “bar code” at Walker Field, Maryland |
Adjacent to the runway of a Navy airfield in Maryland is a paved rectangle. And within that area are a series of quadrilaterals painted bright white, in pairs and ascending in size.
By itself its existence would be a mystery, or at least a curiosity. Except that it is one of dozens to be known throughout the United States, with most of those found near military bases and other restricted facilities. Some remote locations have entire arrays of the “bar codes” stretching for miles toward the horizon.
So what are these test pattern-ish arrangements? Based on available evidence, they seem to have been put in place by the government during the first few decades of the Cold War. With tensions high between the U.S. and the Soviet Union, the advent of high-altitude aircraft reconnaissance – and then “spy” satellites – became an important ...