America's most sophisticated stealth jet fighters have been quietly deployed to an allied base less than 200 miles from Iran's mainland, according to an industry report, but the Air Force adamantly denied the jets' presence is a threat to the Middle East nation. Multiple stealth F-22 Raptors, which have never been combat-tested, are in hangars at the United Arab Emirates' Al Dafra Air Base, just a short hop over the Persian Gulf from Iran's southern border, the trade publication Aviation Week reported.