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When Serbian air defenses downed an F-117A stealth fighter last week, we were dismayed that our ace in the hole had been proved vulnerable. That’s nothing compared with the shock of the day in 1960 when Khrushchev claimed his forces had brought down an ultra-high-flying jet on a spy mission over Soviet territory. What plane? What spy mission? But when the pilot of this officially nonexistent plane was trotted out for the world press to see, we had to ‘fess up. The plane, of course, was the U2, an odd bird with a wingspan that exceeded its length and landing gear that looked like an in-line skate. Norman Polmar will discuss this remarkable chapter in Cold War aviation at noon at the National Air and Space Museum (meet at the gold seal in the Milestones of Flight Gallery), 6th & Independence Ave. SW. Free. (202) 357-2700. (Andrew Webster)