The US Pentagon's Defense Advanced Research Projects Agency is developing a radar system which sees around corners and down into "urban canyons". DARPA hopes to be able to track vehicles across an entire city using just a few uncrewed aircraft.
The U.S. Air Force has contracted with Insitu to fly Scan Eagle surveillance drones over Bagram, Afghanistan, to protect the NATO airbase there.
David Axe reports in March 2010.
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