RECONNAISSANCE The U.S. has developed the world's most advanced spy craft for monitoring an elusive foe
Satellites --Orbiting eyes like the Keyhole can cover wide swaths of the country every day
WHAT THEY CAN DO: Spot objects less than a foot across
WHAT THEY CAN'T DO: Can't spot faces, so they're not particularly useful for finding Osama bin Laden
High-Altitude Planes --The Air Force's U-2 uses cameras and radar to photograph smaller areas than a satellite can manage
WHAT THEY CAN DO: Survey an area for hours at a time, day or night, in any weather
WHAT THEY...
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