Radar-evading technology for the mysterious helicopters that carried out the U.S. special operations raid of Osama bin Laden's walled compound in Pakistan was spawned in the early 1990s at the classified Area 51 installation in Southern Nevada, according to sources close to the black projects facility.
One source familiar with operations at the secret location along Groom Dry Lake, 90 miles north of Las Vegas, said a smaller version stealth helicopter -- an angular, two-seat McDonnell Douglas 500 with sharp edges, riveted body, gull-wing doors and black-brown coating -- would fly "two or three times a day" during 1992 and 1993.
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