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For four decades, senior correspondent Abe Dane wrote in an article in the current issue of Popular Mechanics, Groom Lake has been where the government has come when it wants to be alone- through the top-secret U-2 spyplane program of the '50s, the SR-71 spy plane of the '60s, the F-117A stealth ...

speed at about I, 700 mph. I lis sighting was investigated by the Army Air Force, which feared it might have been a new Soviet secret weapon. But there was another possibility -could it be one of ours? The XFSU-1 "Flying Flapjack" was the cl,,sest thing anyone knew of at the time to a flying sauc...

anythihg like 1,700 mph. The XFSU-1 prototypes were ready by 1947 but never flew. The Arnold sighti n g and other reports remained unsolved. The XFSU-1 wasn't behind them, nor did they seem anything within reach of Soviet technology. The U.S. Air Force secretly launched Project Sign, the first of...