Take a look at the numbers behind drones -- America's mysterious instruments in the war on terror.
On the eve of a speech by President Barack Obama about his administration's counterterrorism policy, Attorney General Eric Holder acknowledged for the first time Wednesday that U.S. drone strikes have killed four Americans overseas since 2009. Here's a look at drones by the numbers:
Courtesy Dan Shakal
Library of Congress
Jason Reed / Reuters
U.S. Army/Sgt. Kimberly Johnson
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