Drones: By the numbers

Published On: May 23 2013 09:45:46 AM CDT   Updated On: Apr 26 2013 01:53:49 PM CDT

Take a look at the numbers behind drones -- America's mysterious instruments in the war on terror.

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U.S. Air Force/Mike Charlie/Getty Images

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:

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